Report: GOP senator once called Mulvaney 'the most dangerous man' in Washington

Senate Appropriations Committee Chairman Richard ShelbyRichard Craig ShelbyOn The Money: Republicans expect Trump to pull controversial Fed nominee | Inside Judy Shelton's confirmation hearing | Trump extends emergency declaration at border Republicans expect Trump to withdraw controversial Fed nominee Pentagon transferring .8 billion to border wall MORE (R-Ala.) once called acting White House chief of staff Mick MulvaneyJohn (Mick) Michael MulvaneyWhite House preparing to ask Congress for funds to combat coronavirus: report Tucker Carlson calls out Mick Mulvaney on immigration remarks: 'Dishonest and stupid' Trump furious after officials allowed Americans with coronavirus to fly home with other passengers: report MORE "the most dangerous man" in Washington because of his influence over President TrumpDonald John TrumpSchiff blasts Trump for making 'false claims' about Russia intel: 'You've betrayed America. Again.' Poll: Sanders leads 2020 Democratic field with 28 percent, followed by Warren and Biden More than 6 in 10 expect Trump to be reelected: poll MORE

The New York Times, citing three people familiar with the exchange, reported on Tuesday that Shelby made the remark while speaking with Sen. Patrick LeahyPatrick Joseph LeahyDemocratic senators ask DOJ watchdog to expand Giuliani probe Overnight Defense: Senate votes to rein in Trump war powers on Iran | Pentagon shifting .8B to border wall | US, Taliban negotiate seven-day 'reduction in violence' Pentagon transferring .8 billion to border wall MORE (D-Vt.) during the government shutdown. 

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Shelby had reportedly grown frustrated with Mulvaney's ability to undo weeks of bipartisan negotiations by making a brief comment to Trump. Shelby has not repeated the statement about Mulvaney in public. 

But the Times noted that when a reporter asked Shelby about Mulvaney on Capitol Hill, the senator interrupted to say, “You mean the acting chief of staff?”

Shelby's office did not immediately respond to a request for comment from The Hill. 

The details about Shelby's comment comes as part of an expansive report on how the dynamic in the White House appears to have changed since Mulvaney became acting chief of staff.

Mulvaney assumed the position earlier this year after former White House chief of staff John KellyJohn Francis KellyMORE departed. 

The Times notes that Mulvaney has gained a number of supporters and critics in his first months in the position, with some viewing him as a figure who has mitigated rivalries within the White House. 

Others believe the former GOP congressman has influenced the president in negative ways. 

“I hope that the president or some of the people around him will realize that his administration is far from a fine-tuned machine,” Senate Minority Leader Charles SchumerCharles (Chuck) Ellis SchumerWhite House preparing to ask Congress for funds to combat coronavirus: report Schumer cites security, DHS ban in questioning TSA use of TikTok Russian interference reports rock Capitol Hill MORE (D-N.Y.) said on the Senate floor, according to The Times. “It’s a slow-motion disaster machine that the American people see in action every day.”