Senate Minority Leader Charles Schumer Chuck SchumerMcConnell accuses Democrats of sowing division by 'downplaying progress' on election security Warren, Schumer introduce plan for next president to cancel ,000 in student debt Schumer lashes out at Trump over 'blue states' remark: 'What a disgrace' MORE (D-N.Y.) wants the Senate Intelligence Committee to speed up its probe of Russia's meddling in the 2016 White House race amid reports of frustration about the pace of the investigation.

"The last few weeks things have moved very, very slowly under Chairman [Richard] Burr's [R-N.C.] leadership, and I'm a little troubled about it," Schumer told reporters on Tuesday.

Schumer — whose is an ex-officio committee member because he is the Senate Democratic leader — added that he has a "great deal of confidence" in 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 (D-Va.), the top Democrat on the committee.

"I give Sen. Warner some time and credence to try to work those things out, but things have moved too slowly for my taste and, I think, a lot of members of the committee's taste," he added.

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The Intelligence Committee's investigation, which also includes possible contacts between President Trump's campaign and Moscow, has come under fire amid reports that the probe is moving slowly and understaffed.

Sources told Yahoo News that the investigation is being undercut by "partisan divisions."

Separately, The Daily Beast reported on Monday that there are no full-time staffers assigned to the investigation, which involves sorting through thousands of pages of documents.

Two sources added that the committee has not yet interviewed former national security adviser Michael Flynn; Roger Stone and Carter Page, two advisers during Trump's campaign; former Trump campaign manager Paul Manafort; or White House adviser Jared Kushner, who is also Trump's son-in-law.

Sen. Ron Wyden Ronald (Ron) Lee WydenGOP senator blocks Schumer resolution aimed at Biden probe as tensions run high Republican Senators raise concerns over Oracle-TikTok deal Hillicon Valley: TikTok, Oracle seek Trump's approval as clock winds down | Hackers arrested for allegedly defacing U.S. websites after death of Iranian general | 400K people register to vote on Snapchat MORE (D-Ore.) — a member of the committee — told The Daily Beast that he doesn't believe that the committee is moving fast enough or is doing enough to be transparent about its investigation.

"For weeks I've called for the committee to move more quickly and more transparently, particularly on the key issue of following the money in this investigation," he said in a statement.

Wyden has previously pushed the committee to do more of its work publicly and probe any financial ties between Trump and Moscow as part of its investigation.

But GOP Sens. James Lankford (Okla.) and Susan Collins Susan Margaret CollinsThe Hill's Campaign Report: Biden asks if public can trust vaccine from Trump ahead of Election Day | Oklahoma health officials raised red flags before Trump rally Gideon leads Collins by 12 points in Maine Senate race: poll Senate leaders quash talk of rank-and-file COVID-19 deal MORE (Maine) have defended the committee's work.

"Reports about #Russia probe are wrong. Don’t confuse silence for lack of progress. Intel Cmte must conduct classified investigations quietly," Lankford said on Twitter.

Warner and Burr have strived to publicly show a united front, including holding a joint press conference earlier this year to stress the bipartisan nature of the Senate's probe.