Former independent counsel Ken Starr said there would be "hell to pay" politically for President TrumpDonald John TrumpTrump rips Dems' demands, impeachment talk: 'Witch Hunt continues!' Nevada Senate passes bill that would give Electoral College votes to winner of national popular vote The Hill's Morning Report - Pelosi remains firm despite new impeachment push MORE if he were to fire Attorney General Jeff SessionsJefferson (Jeff) Beauregard SessionsHouse Democrats leave empty chair for McGahn at hearing MSNBC host: Barr 'the most dangerous person' who works for Trump Chris Wallace: AG Barr 'clearly is protecting' Trump MORE and the special counsel in charge of the Russia investigation, Robert MuellerRobert (Bob) Swan MuellerHouse progressive: Pelosi 'has it right' on impeachment Democrats talk subpoena for Mueller Democratic Rep. Ro Khanna: 'I'm not there yet' on impeachment 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 RosensteinDemocrats talk subpoena for Mueller Klobuchar: 'Don't think' there are reasons to investigate Mueller probe's origins Democrats are running out of stunts to pull from impeachment playbook 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 ManafortRoger Stone considers suing to discover if he was spied on by FBI Ukrainian who meddled against Trump in 2016 is now under Russia-corruption cloud Feds ask judge to postpone ex-Trump campaign aide's sentencing MORE, the president's former campaign chairman, sparing him from a second trial previously set to begin this month.