Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellFEC flags McConnell campaign over suspected accounting errors Poll: 59 percent think president elected in November should name next Supreme Court justice Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' MORE (R-Ky.) says he wants to give the Senate Intelligence Committee as much time as possible to finish its investigation into Russian election meddling and stressed it must remain bipartisan.

Asked if he was worried about the probe stretching into the heart of next year’s campaign season, McConnell said, “I’d like to see them wrap it up when they finish.”

“I trust Sen. Burr and Sen. Warner to do our part,” he said referring to Sens. Richard Burr Richard Mauze BurrRep. Mark Walker says he's been contacted about Liberty University vacancy Overnight Defense: Trump rejects major cut to military health care | Senate report says Trump campaign's Russia contacts posed 'grave' threat Senate report describes closer ties between 2016 Trump campaign, Russia MORE (R-N.C.) and Mark Warner Mark Robert WarnerDemocrats call for declassifying election threats after briefing by Trump officials It's time to upgrade benefits Intelligence chief says Congress will get some in-person election security briefings MORE (D-Va.), the chairman and vice chairman, respectively, of the Senate Intelligence Committee.

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“It’s not up to me to say when it’s over, it’s up to them to say when it’s over,” he said. “What I hope is that in the end we have a bipartisan report. If it’s purely partisan, I don’t think anyone will give it any credibility."

“I hope those guys can stay together and tell us what happened and what we need to do to prevent it from happening again,” he added.

McConnell spoke to reporters Friday in an end-of-year press conference touting Republican accomplishments in 2017.

The New York Times reported in August that McConnell had a heated conversation with President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE at the time in which the president expressed frustration with the leader for not doing more to shield him from the congressional probes.

Burr says the committee has dozens of interviews to conduct and on Thursday declined to provide an estimate about when it might wrap up its work.

“I think it’s impossible to guess but it’s clearly some time in the next calendar year,” Burr told The Hill.

Several witnesses are scheduled to be interviewed in January.

Warner says “principals” such as Jared Kushner Jared Corey KushnerAbraham Accords: New hope for peace in Middle East Tenants in Kushner building file lawsuit alleging dangerous living conditions Trump hosts Israel, UAE, Bahrain for historic signing MORE, Trump’s son-in-law and a senior White House adviser, and Donald Trump Jr. Don John Trump'Tiger King' star Joe Exotic requests pardon from Trump: 'Be my hero please' Zaid Jilani discusses Trump's move to cancel racial sensitivity training at federal agencies Trump International Hotel in Vancouver closes permanently MORE will have to come back before the committee to answer questions.

“[For] most members, Democrat and Republican, it will be hard for them to reach any final conclusions without being able to see some of the principals and obviously Mr. Kushner would fall in that category,” Warner said.

He would prefer those key witnesses testify in public.

Warner on Thursday said he has a great working relationship with Burr despite what he called a few “bumps” in the road.

“We’ve really put some points on the board already,” he said at an event sponsored by Axios. “There is complete conclusion from everyone in government, with potentially the exception of the president, that Russians massively interfered in our elections in a coordinated way that was unprecedented."