Sen. John McCain (R-AZ) is calling for a single investigation into Russia’s meddling to influence the 2016 presidential election, the New York Times reports.

McCain: “The responsibilities for cyber is spread over about four different committees in the Senate, and each doing their own thing, frankly, is not going to be the most efficient way of arriving at a conclusion. This is serious business.”

This comes as a bipartisan group of senators, including McCain, issued a joint letter about creating the committee to investigate the sabotage.

The letter, which was jointly sent by Sens. Charles Schumer (D-NY), Lindsey Graham (R-SC), Jack Reed (D-RI) and McCain, was sent to Senate Majority Leader Mitch McConnell: “Recent reports of Russian interference in our election should alarm every American.” They argued that cybersecurity is “the ultimate cross-jurisdictional challenge” that requires a “comprehensive approach.”“Therefore would ask for your support in establishing a temporary Select Committee on Cyber.”

Donald Trump continues to say there is no proof that the Russians are behind the hacking. Hillary Clinton said that the sabotage and FBI Director James Comey’s letter to Congress 11 days before the election caused her loss.

John McCain Calls for Single Investigation Into Russian Cyberattacks in US Election