Related: Trump impeachment trial: Justice Roberts scolds both sides as Senate to hear opening arguments – live

Live coverage of the impeachment trial continues on Wednesday’s blog:

Related: Trump impeachment trial: Justice Roberts scolds both sides as Senate to hear opening arguments – live

The Office of Management and Budget responded to a FOIA request by releasing a trove of documents on military aid to Ukraine.

The watchdog organization made “request for directives and communications that may relate to any effort to pressure the Ukrainian government to investigate one of President Trump’s political opponents as part of an effort to give the president an electoral advantage,” it said.

Senators kill the 10th Democratic amendment to allow for additional time to file responses to motions. The rules provide each side two hours. Schumer’s amendment asked for 24.

The debate on this one was very short — things are speeding up.

As expected, Democrats’ eighth amendment, like all the others, was voted down, along party lines. Republicans blocked the Democratic push to subpoena John Bolton.

The former national security advisor could still testify if a majority of senators vote to subpoena his testimony later.

They also killed a ninth amendment, which would force a Senate vote on any motion to subpoena witnesses and documents. The current rules require a procedural vote that must pass before a vote on subpoenas. In this vote, there was one Republican defector: Senator Susan Collins.

John Roberts took an opportunity to rebuke both House managers and the White House counsel “in equal terms” for their language and personal attacks. He asked everyone to “avoid speaking in a manner and using language that is not conducive to civil discourse”.

Roberts also offered a fun fact. In 1905, a Senator objected to a manager using the word “pettifogging” and the presiding officer found that the world “ought not to be used”, he said. “I don’t think we need to aspire to that high a standard, but I do think those addressing the senate should remember where they are,” Roberts added.

In response, White House lawyer Jay Sekulow raised his voice and banged the podium for emphasis. He accused Nadler of trying to “shred Constitution on the floor of the floor of the Senate” by questioning Donald Trump’s executive privilege claim.

Pat Cipollone called the impeachment a “farce”.

“Mister Nadler, you owe an apology to the President of the United States and his family, you owe an apology to the Senate, but most of all you owe an apology to the American people,” he said.

Nadler: ‘Only guilty people try to hide the evidence’

Arguing for a subpoena of John Bolton, Jerrold Nadler accused senators quashing against Democrats’ attempts to bring forth more witnesses of “voting for a coverup”.

“Voting to deny witnesses and obviously a treacherous vote,” Nadler said. “A vote against an honest consideration of the evidence against the President. A vote against an honest trial. A vote against the United States.”

Nadler also said that Trump’s supporters want to block Bolton’s testimony are doing so because “they know he knows too much”.

“Only guilty people try to hide evidence,” Nadler said.

Seventh Democratic amendment tabled, along party lines. And we move on to yet the next amendment… to subpoena John Bolton.

Each side gets an hour to make their case. This time, Jerrold Nadler, the representative from New York and House Judiciary chair, is arguing the Democrats’ case. Bolton, a former national security advisor, recently said he is willing to testify after resisting doing so during the impeachment inquiry. Donald Trump has said he’ll block Bolton, invoking executive privilege.

Democrats believe that Bolton has firsthand information about the president’s efforts to secure a quid pro quo with the government of Ukraine. Three Republican senators — Mitt Romney, Lisa Murkowski and Susan Collins — have indicated they might want to hear from Bolton. But it’s unlikely they’ll vote to approve the amendment to subpoena Bolton today. Collins said in a statement today that she’ll consider witnesses after hearing the case, and answers to senators’ questions.

Chief Justice John Roberts, who has been presiding over the trial all day, will have to be up early tomorrow morning for his day job. At 10 am Eastern Time, he’s expected to hear arguments in a Supreme Court case to decide whether publicly funded religious education is constitutional.

Even today, his very long day started at the Supreme Court, where he oversaw oral arguments in two cases before heading to the Senate.

The constitution requires that the chief justice “shall preside” over an impeachment trial of a president. In practice, the role has mostly been ceremonial. Previously, chief justices have left it to a Senate parliamentarian to manage the process. Roberts could take a more hands-on approach, and compel witnesses to testify — but that’s unlikely to happen.

So far, Roberts’ role in the Senate trial has been to ask White House lawyers and impeachment managers to speak, in turn, and grant motions to take recess as needed.

What the cameras aren’t showing us

The video feed of the trial is controlled by the Senate Recording Studio. C-SPAN asked Mitch McConnell for permission to bring in its own cameras because the existing setup “provides a restricted view of Senate floor debates”, but the Senate majority leader did not respond, the New Yorker reports.

As a result, people at home can’t catch a glimpse of Senator Kyrsten Sinema’s bright yellow boots, or hear what lawmakers are whispering to each other in between presentations. We can’t see the expression on Lisa Murkowski’s face or snoop on what Marco Rubio is scribbling in his notebook.

TV camera crews are also restricted outside the Senate chamber — reporters aren’t allowed to approach senators directly outside.

Some news organizations have commissioned courtroom sketch artists to capture what the cameras aren’t showing.

The Democrats’ fifth amendment today is to subpoena documents from the Department of Defense. There will be two hours of debate on this impeachment as well, and it’s unclear how late the trial will go tonight.

Read The Guardian’s recap of the trial so far:

In four consecutive votes split precisely on party lines, the Senate voted down Democratic proposals to subpoena the testimony of the acting White House chief of staff, Mick Mulvaney, and to subpoena documents and records from the White House, the state department and the budget office relevant to an alleged scheme by Trump to twist the powers of the presidency to extract personal political favors from Ukraine.

Each of the proposed subpoenas was defeated by a 53-47 vote. Democrats accused Republicans of failing to commit to a fair impeachment trial and of engaging in a “cover-up” of misconduct by the president.

“The president is engaged in this cover-up because he is guilty, and he knows it,” said Representative Val Demings of Florida, one of the impeachment prosecutors, referred to as “managers”, in the case.

A further opportunity for the senators to demand documents or witnesses was anticipated in the weeks ahead. But Adam Schiff, the lead impeachment manager, urged the senators to issue subpoenas before an allotted period for senators to question the legal teams.

“You should want to see these documents,” said Schiff. “You should want to know what these private emails and text messages have to say.

“The American people want a fair trial,” Schiff said. “But a great many Americans don’t believe that will happen. Let’s prove them wrong.”

Related: Trump impeachment trial: Senate votes down Democrats’ subpoena proposals

Report: Senate Democrats are privately considering allowing Republicans to call Hunter Biden as a witness, in exchange for testimony from a key Trump administration official.

Though Democrats have publicly dismissed Republicans’ calls to subpoena Joe Biden’s son Hunter, privately, some senators and aides considering making an unusual deal. They’re willing to call in one of the Bidens if Republicans agree to subpoena national security advisor John Bolton, or another administration official with firsthand knowledge of the Ukraine controversy, the Washington Post reports:

The discussions about the Bidens are being closely held, and the issue is fraught for Democrats, due to the differing levels of support for Biden in a chamber stocked with presidential candidates and the clashing views on impeachment strategy. In private conversations in recent days, there has been much loathing of the Republicans’ spotlight on the Bidens among Senate Democrats, but also a fear that unless a witness deal is eventually struck, the trial could proceed without witnesses, according to party officials and Senate aides.

That predicament has led to discussions about whether, down the line, Hunter Biden or Joe Biden should be considered as part of a witness proposal. But there is hesitancy to raise the issue publicly until Senate Democratic leaders signal interest, the officials and aides said.

For the fourth time today, senators voted to kill a Democratic amendment to the impeachment trial resolution, deciding against calling Mick Mulvaney as a witness.

In October, Mulvaney admitted that Donald Trump froze nearly 0 million in aid to Ukraine in part to pressure Ukranian officials into investigating Democrats. Almost immediately, he denied it.

Senate leader Mitch McConnell asked the Democrats to “stack” their amendments. Chuck Schumer refused, but said he’d be opening to having some of the votes tomorrow. “There will be a good number of votes. There’s no reason we have to do them tonight,” Schumer said.

Addressing the Democratic senators running for president, White House lawyer Pat Cipollone said the whole impeachment process was about “removing” Donald Trump from the 2020 ballot.

This wasn’t the first time Cipollone singled out the 2020 candidates. Earlier, he suggested that Amy Klobuchar, Bernie Sanders, Elizabeth Warren and Michael Bennett were sour they couldn’t campaign this week. “ Some of you are upset because you should be in Iowa right now,” he said.

Klobuchar responded by saying she’s able to “do two things at once”.

The first day of the trial has been far less dramatic than expected. The Guardian’s David Smith fills in what the Senate cameras aren’t showing:

This moment had been much hyped by cable TV but viewers hoping for the political equivalent of the OJ Simpson trial were in for a disappointment. There was no prisoner in the dock; Trump is thousands of miles away in Davos. This was reality TV without the reality TV president.

There was, however, the California Democrat Adam Schiff, the lead House manager in the impeachment trial, who once wrote a screenplay for a Hollywood crime thriller. He was not quite Henry Fonda in 12 Angry Men or Tom Cruise in A Few Good Men, but he did put Republicans on the spot over their pledge on oath to be impartial jurors.

“The American people want a fair trial. They want to believe their system of government is still capable of rising to the occasion,” Schiff entreated. “They want to believe we can rise above party and do what’s best for the country, but a great many Americans don’t believe that will happen. Let’s prove them wrong. Let’s prove them wrong!”

In the Hollywood version, the chamber erupted in applause, heavenly horns played and a solitary tear trickled down McConnell’s face. In the Washington version, however, Republicans sat or slouched expressionless or studied papers on their desks, while McConnell fixed Schiff with a death stare as if intent on turning him to stone.

Related: As Trump goes on trial, so does the conscience of the Republican party

The trial has resumed after a 30-minute dinner break. Hakeem Jeffries, one of the House impeachment managers, is now making the case to subpoena Mick Mulvaney.

The congressman from New York said Donald Trump makes Richard Nixon “look like a choir boy”. Trump is “personally responsible for depriving the Senate of information important to consider in this trial”, Jeffries said, referring to the president’s efforts to block House investigators from accessing documents and witnesses throughout the impeachment inquiry.

“Evidence matters. And the truth matters,” Jeffries said.

But Republicans have voted down multiple Democratic efforts to subpoena more evidence. The trial, writes the Guardian’s David Smith, is testing conscience of the Republican party.

Related: As Trump goes on trial, so does the conscience of the Republican party

Both parties have two hours to debate this amendment, and then, the Senate majority leader, Mitch McConnell, indicated he’ll move to table it. After a vote, the lawmakers will get a 30-minute break – which, from the looks of everyone in the chamber is much needed.

Senator James Risch of Idaho appeared to nod off, according to reporters.

Senator Kirsten Gillibrand seemed to rest her eyes for a bit as well. And Senator Martha McSally had a blanket on her lap.

Meanwhile, in 2020 news…

Rush, a Democratic representative from Illinois, told the Chicago Sun-Times he was impressed by Bloomberg’s approach to the “economic discrimination in the black community.”

The congressman had endorsed Kamala Harris before she dropped out of the presidential race.

To demonstrate the importance of subpoenaing the state department, Val Demings displayed text messages between the US envoy to Ukraine Kurt Volker and the US diplomat Bill Taylor, which were uncovered during the House impeachment inquiry. One of the messages seemed to confirm that the Trump administration was withholding military aid in order to pressure Ukrainian officials to investigate Trump’s political rivals.

The texts and other messages uncovered by House investigators make clear that there’s more damaging information out there, Demings said. But the Trump administration has been blocking the release of information, claiming executive privilege.

Information obtained through a Senate subpoena “would help complete our understanding of how the president’s scheme unfolded in realtime”, Demings said.

Republican senator indicates she’ll support a motion to subpoena witnesses

Susan Collins, a Republican senator from Maine, issued a statement indicating that she will likely support a motion to call more witnesses.

The Senate is now taking a ten-minute recess, after which the House impeachment managers and Trump’s legal team will be allowed to debate Chuck Schumer’s second amendment to Mitch McConnell’s impeachment trial resolution.

But McConnell said he intended to propose to also table that amendment, and that motion is likely to succeed on a party-line vote, as the first motion to table did.

As expected, Senate majority leader Mitch McConnell has introduced a motion to table (or kill) Chuck Schumer’s amendment, which calls for subpoenaeing White House documents related to Trump’s impeachment charges.

The motion to table is expected to pass along party lines, and Schumer will then likely introduce another amendment to McConnell’s resolution outlining the rules for the impeachment trial.

House impeachment manager Zoe Lofgren pushed back against arguments from Pat Philbin, deputy counsel to the president, that the House is trying to get the Senate to do its investigative job.

“The House is certainly not asking the Senate to do the House’s job,” Lofgren said. “The House is asking the Senate to do its job.”

The House impeachment managers and the president’s legal team continue to debate an amendment from Senate minority leader Chuck Schumer calling for the White House to be subpoenaed for relevant documents.

Fun fact: House impeachment manager Adam Schiff is not actually the first person to use the term “ass-backwards” on the Senate floor.

That honor appears to go to Republican senator Lindsey Graham, who used the term in 2016 to denounce a bipartisan proposal to block a military arms sale to Saudi Arabia.

“I think it would be pretty odd for members on the other side of the aisle who almost unanimously supported the Iranian nuclear agreement … [to] deny a weapons sale to somebody who is in the fight with you,” Graham said at the time. “You’re talking about ass-backwards.”

Former Republican senator Jeff Flake, who declined to run for reelection in 2018 because of his opposition to Trump, was spotted in the Senate chamber as the president’s impeachment trial continues.

Flake wrote a Washington Post op-ed last month urging his former Republican colleagues to “put country over party” once the trial began:

I don’t envy you. You’re on a big stage now. Please don’t accept an alternate reality that would have us believe in things that obviously are not true, in the service of executive behavior that we never would have encouraged and a theory of executive power that we have always found abhorrent.

If there ever was a time to put country over party, it is now. And by putting country over party, you might just save the Grand Old Party before it’s too late.

House impeachment manager Zoe Lofgren has now taken the Senate floor to argue for the need to subpoena White House documents related to the charges against Trump.

Lofgren, who participated in the Clinton and Nixon impeachment cases, will make history as the first woman to present arguments as a manager during an impeachment trial.

The New York Times has more on Lofgren’s impeachment history:

She was a member of the House Judiciary Committee in 1998 when it approved articles of impeachment against President Bill Clinton for lying about an affair with a White House intern. And as a young law student in 1974, she helped the committee draft its Watergate charges against President Richard M. Nixon.

Now — 46 years after the Nixon case — the 72-year-old lawmaker will take a high-profile role in the nation’s third impeachment trial, serving as one of the managers who will prosecute the House’s case against President Trump in the Senate.

Amy Klobuchar, one of the Democratic senators running for president, psuhed back against a comment from White House counsel Pat Cipollone that the presidential candidates are “upset” to be away from the campaign trail.

As Trump’s impeachment trial continues on Capitol Hill, Joe Biden is holding a campaign event in Ames, Iowa, with less than two weeks to go until the state’s caucuses.

Two of Biden’s closest rivals — senators Bernie Sanders and Elizabeth Warren — have been pulled away from the campaign trial because of the impeachment trial, and Sanders has already had to cancel at least one rally because of the trial schedule.

A Yahoo News reporter sitting in the trial room said Republicans appeared uncomfortable as House impeachment manager Adam Schiff made the case for Trump