Democratic Sens. Elizabeth Warren Elizabeth WarrenDimon: Wealth tax 'almost impossible to do' CNN's Don Lemon: 'Blow up the entire system' remark taken out of context Democrats shoot down talk of expanding Supreme Court MORE (Mass.) and Sheldon Whitehouse Sheldon WhitehouseFeinstein 'surprised and taken aback' by suggestion she's not up for Supreme Court fight Hillicon Valley: Murky TikTok deal raises questions about China's role | Twitter investigating automated image previews over apparent algorithmic bias | House approves bill making hacking federal voting systems a crime House approves legislation making hacking voting systems a federal crime MORE (R.I.) took to the Senate floor Thursday to charge that President-elect Donald 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 is already walking back his pledge to "drain the swamp."

Warren said that roughly a week after the presidential election, Trump is "inviting the biggest, ugliest swamp monsters in the front door."

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"We've heard reports that Vice President-elect Mike Pence Michael (Mike) Richard PenceThe Hill's 12:30 Report: Ginsburg lies in repose Buttigieg stands in as Pence for Harris's debate practice Trump argues full Supreme Court needed to settle potential election disputes MORE has now decided to remove all the lobbyist from the transition team," she said from the Senate floor. "Yeah, I'll believe it when I see it. ... Trump promised to drain the swamp, and after one week we've seen what Donald Trump's promise means. Nothing."

NBC News reported Wednesday that Pence has ordered that all lobbyists be removed from the transition team.

Trump, during a CBS News interview earlier in the week, acknowledged his team contains lobbyists but argued that Washington is all "one big lobbyist" and promised his administration would "phase that out."

Whitehouse said Trump's campaign pledge to "drain the swamp" could be an area where Democrats are able to work with his administration.

"There are a lot of very powerful creatures in the swamp," he said. "It's one thing to say you're going to drain it. It's another thing to actually take them on."

Warren and Sen. Bernie Sanders Bernie SandersOutrage erupts over Breonna Taylor grand jury ruling Dimon: Wealth tax 'almost impossible to do' Grand jury charges no officers in Breonna Taylor death MORE (I-Vt.) both questioned Trump's transition team on Tuesday.

Apart from the issue of lobbyists on the team, Democrats have also homed in on Trump's decision to make former Breitbart News executive Stephen Bannon his chief strategist and senior counselor.

Sen. Al Franken Alan (Al) Stuart FrankenGOP Senate candidate says Trump, Republicans will surprise in Minnesota Peterson faces fight of his career in deep-red Minnesota district Getting tight — the psychology of cancel culture MORE (D-Minn.) spoke from the Senate floor on Thursday next to a sign of headlines from the conservative website, including one from 2015 that read: "Gabby Giffords: The gun control movement's human shield."

"This is nasty stuff. This is vile, and it comes all the way from the top, from Mr. Bannon himself," Franken said. "We have no reason to believe that Mr. Bannon would not seek to deploy such tactics from the White House."

Democratic Sens. Patrick Leahy Patrick Joseph LeahyDemocrats shoot down talk of expanding Supreme Court Battle over timing complicates Democratic shutdown strategy Hillicon Valley: Russia 'amplifying' concerns around mail-in voting to undermine election | Facebook and Twitter take steps to limit Trump remarks on voting | Facebook to block political ads ahead of election MORE (Vt.) and Jeff Merkley Jeffrey (Jeff) Alan MerkleyThe Hill's Morning Report - Sponsored by The Air Line Pilots Association - Trump, Biden renew push for Latino support Sunday shows - Trump team defends coronavirus response Oregon senator says Trump's blame on 'forest management' for wildfires is 'just a big and devastating lie' MORE (Ore.) also spoke against Bannon from the Senate floor on Thursday.

Ten senators, including Merkley and Franken, as well as Sen.-elect Chris Van Hollen (D-Md.), sent Trump a letter on Thursday urging that he "immediately" fire Bannon.

Republicans, including 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 (Ky.), have largely sidestepped weighing in on the appointment. Many GOP lawmakers have also noted they've never met Trump's chief aid.

But Trump campaign manager Kellyanne Conway said people should look at Bannon's entire career, which includes stints on Wall Street, in the Navy and in Hollywood.

“He has got a Harvard business degree. He’s a naval officer. He has success in entertainment,” she told reporters Monday in Trump Tower, according to The New York Times. She also called him a “brilliant tactician.”