Democrats escalated their demands late Wednesday that Attorney General Jeff Sessions recuse himself from overseeing an investigation into contacts between the Trump campaign and the Russian government after a disclosure that Sessions himself spoke with the Russian ambassador last year, seemingly contradicting his testimony at his confirmation hearing.

And some Democrats went further, suggesting that Sessions had perjured himself and demanding that he resign.

At the confirmation hearing for attorney general in January, Senator Al Franken, Democrat of Minnesota, asked Sessions about a CNN report that intelligence briefers had told Barack Obama, then the president, and Trump, then the president-elect, that Russian operatives claimed to have compromising information about Trump.

Franken also noted that the report indicated that surrogates for Trump and intermediaries for the Russian government continued to exchange information during the Campaign. He asked Sessions what he would do if that report proved true.

Sessions replied that he was “not aware of any of those activities.” He added: “I have been called a surrogate at a time or two in that campaign, and I didn’t have — did not have communications with the Russians, and I’m unable to comment on it.”

But the Justice Department acknowledged on Wednesday that Sessions had twice communicated with the Russian ambassador last year. The first time was in July, at the Republican National Convention, after he gave a speech at an event for ambassadors sponsored by the Heritage Foundation. The second time was a visit to his office by (Russian Ambassador Sergey) Kislyak in September. The Washington Post earlier reported both encounters.

A word of caution: Benjamin Wittes, editor in chief of the blog Lawfare, said on Twitter that there’s probably not enough for a perjury charge. He argued that there is enough ambiguity about whether Sessions, at his hearing, meant he had no communication with Russia as part of his work as a campaign surrogate versus his work as a senator. If he was speaking exclusively about his work on the behalf of the campaign, Sessions could argue that his work as a US senator was a separate matter.

“There was absolutely nothing misleading about his answer,” Sessions spokesperson Sarah Isgur Flores said. “Last year, the senator had over 25 conversations with foreign ambassadors as a senior member of the Armed Services Committee, including the British, Korean, Japanese, Polish, Indian, Chinese, Canadian, Australian, German and Russian ambassadors. He was asked during the hearing about communications between Russia and the Trump campaign — not about meetings he took as a senator and a member of the Armed Services Committee.”

Sessions, for his part, made a similar argument in his statement: “I never met with any Russian officials to discuss issues of the campaign. I have no idea what this allegation is about. It is false.”

Sessions seems to misunderstand the allegations in his statement. It’s not whether he met with Russian officials to discuss issues of the campaign, but whether he spoke with them in any capacity despite telling Congress he had no communications with Russians. His spokesperson’s statement and his own statement only deny that he spoke with Russian officials as a campaign surrogate, but he still apparently communicated with a Russian official as a senator.

The Post report suggests that Sessions’ contact with Kislyak, even as a member of the Senate Armed Services Committee at the time, was unusual. Among the 20 (of 26) members of the committee who responded to the Post, none of them met with Russia’s ambassador last year.