The top Democrat on the Senate Select Committee on Intelligence says he has “grave concerns” about the independence of an investigation into President Trump’s aides’ ties to Russia.

Sen. Mark Warner Mark Robert WarnerIntelligence chief says Congress will get some in-person election security briefings Overnight Defense: Trump hosts Israel, UAE, Bahrain for historic signing l Air Force reveals it secretly built and flew new fighter jet l Coronavirus creates delay in Pentagon research for alternative to 'forever chemicals' House approves bill to secure internet-connected federal devices against cyber threats MORE’s (D-Va.) comments Saturday came on the heels of news reports that the White House sought the help of senior intelligence officials and lawmakers on the House and Senate intelligence committees to knock down news stories about Trump associates communicating with Russian officials during his 2016 presidential campaign.

“I have called Director Pompeo and Chairman Burr to express my grave concerns about what this means for the independence of this investigation and a bipartisan commitment to follow the facts, and to reinforce that I will not accept any process that is undermined by political interference,” Warner said in a statement, referring to CIA Director Mike Pompeo and Sen. 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.), who chairs the Intelligence Committee.

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Warner also said he would consult with the other members of the Senate intelligence panel to ensure that its investigation was free of meddling or influence from the White House.

“It will be up to Republican leadership to demonstrate in the days ahead that they are capable of pursuing this investigation,” Warner said.

Both Warner and Burr said earlier this month that the intelligence committee’s ongoing investigation into Russia’s role in the election must also probe the reported contacts between Trump’s campaign aides and Russian officials.

Democrats and a few Republican lawmakers have called for the creation of a special committee to investigation Russian interference in the 2016 election, as well as Trump’s potential ties to Moscow.

But GOP congressional leaders have largely dismissed that idea, arguing that existing committees are capable of handling the investigation.

“I have said from the very beginning of this matter that if SSCI cannot properly conduct an independent investigation, I will support empowering whoever can do it right,” Warner said.​