Former independent counsel Ken Starr said there would be "hell to pay" politically for President TrumpDonald John TrumpTrump alludes to possible 2024 run in White House remarks Trump threatens to veto defense bill over tech liability shield Tiger King's attorney believes they're close to getting pardon from Trump MORE if he were to fire Attorney General Jeff SessionsJefferson (Jeff) Beauregard SessionsTime to bring federal employees home for every holiday Alabama zeroes in on Richard Shelby's future Tuberville incorrectly says Gore was president-elect in 2000 MORE and the special counsel in charge of the Russia investigation, Robert MuellerRobert (Bob) MuellerBarr taps attorney investigating Russia probe origins as special counsel CNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting MORE.

Asked by Bloomberg News anchor David Westin on Friday why Trump has not yet fired Sessions, who Westin notes serves "at the pleasure of the president," Starr predicted the president would face difficulties attempting to appoint Sessions's replacement.

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“I think that there would be hell to pay if the president fired Mueller or ordered the firing of Bob Mueller,” Starr said in the interview.

"Jeff Sessions I think is an honorable person who recused himself, so I think obviously the president has that prerogative, but it would be very hard to get a new attorney general confirmed," he continued. "We would have Rod RosensteinRod RosensteinTrump turns his ire toward Cabinet members Ex-deputy attorney general says Justice Dept. 'will ignore' Trump's threats against political rivals The Hill's Morning Report - Sponsored by Facebook - Trump's erratic tweets upend stimulus talks; COVID-19 spreads in White House MORE as the acting attorney general of the United States indefinitely."

Starr served on the 1998 Republican-led investigation of former President Clinton, who was eventually impeached by the House but not convicted by the Senate on charges of perjury and obstruction of justice.

Speculation has grown over whether Trump will fire Sessions or Mueller in recent weeks as Trump's tone on Twitter increasingly turned towards direct calls for the investigation to be ended by Sessions.

"Attorney General Jeff Sessions should stop this Rigged Witch Hunt right now, before it continues to stain our country any further," Trump tweeted in early August.

The president has also frequently attacked Mueller and the FBI investigators working with the special counsel's office, whom he frequently refers to as "angry Democrats."

"Bob Mueller is totally conflicted, and his 17 Angry Democrats that are doing his dirty work are a disgrace to USA!" he added in the same tweet.

Mueller's probe reached a milestone this week after prosecutors reached a plea agreement with Paul ManafortPaul John Manafort3 take-aways from the Michael Flynn pardon Flynn spurs questions of who Trump might pardon next On The Money: Initial jobless claims rise for 2nd week | Dow dips below 30K | Mnuchin draws fire for COVID-19 relief move | Manhattan DA appeals dismissal of Manafort charges MORE, the president's former campaign chairman, sparing him from a second trial previously set to begin this month.