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

Senate Appropriations Committee Chairman Richard ShelbyRichard Craig Shelby20 Dems demand no more money for ICE agents, Trump wall Conservatives urge Trump to stick with Moore for Fed Poll: Roy Moore leading Alabama GOP field MORE (R-Ala.) once called acting White House chief of staff Mick MulvaneyJohn (Mick) Michael MulvaneyDemocratic Party chief: Trump is 'compromised' The Hill's Morning Report - Trump tells House investigators 'no' Hillicon Valley: Facebook expects up to B FTC fine | DHS face scanning at airports sparks alarm | New Twitter tool targets election misinformation | Lawmakers want answers on Google 'Sensorvault' MORE "the most dangerous man" in Washington because of his influence over President TrumpDonald John TrumpForget the spin: Five unrefuted Mueller Report revelations Lara Trump: Merkel admitting migrants 'one of the worst things that ever happened to Germany' Financial satisfaction hits record high: survey 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 LeahyDurbin calls Mueller report findings on Trump team 'troubling' 20 Dems demand no more money for ICE agents, Trump wall The Hill's 12:30 Report: Trump, Dems prep for Mueller report's release 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 SchumerMJ Hegar announces Texas Senate bid Hillicon Valley: House Dems subpoena full Mueller report | DOJ pushes back at 'premature' subpoena | Dems reject offer to view report with fewer redactions | Trump camp runs Facebook ads about Mueller report | Uber gets B for self-driving cars Dem legal analyst says media 'overplayed' hand in Mueller coverage 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.”