Former independent counsel Ken Starr defended special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE on Monday amid President 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's attacks on the probe into Russia's election meddling.

"We have to do it. We have to hold the president accountable," Starr told Hill.TV's Buck Sexton and Krystal Ball on "Rising," when asked about Mueller's probe.

"I've been harshly critical of the president for his criticisms in terms of the attorney general, as well as the Mueller probe," he said.

"I have criticized or expressed concerns about some of the people around Bob Mueller, but I have very high confidence in Mueller himself," he continued.

Trump has launched a series of attacks on Mueller's probe into Russia's election interference, fueling speculation that the president will fire Sessions, who has recused himself from the investigation.

The president has also publicly directed Sessions to end the probe.

"This is a terrible situation and Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsGOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status MORE should stop this Rigged Witch Hunt right now, before it continues to stain our country any further. Bob Mueller is totally conflicted, and his 17 Angry Democrats that are doing his dirty work are a disgrace to USA!" Trump tweeted last month.

..This is a terrible situation and Attorney General Jeff Sessions should stop this Rigged Witch Hunt right now, before it continues to stain our country any further. Bob Mueller is totally conflicted, and his 17 Angry Democrats that are doing his dirty work are a disgrace to USA! — Donald J. Trump (@realDonaldTrump) August 1, 2018

Starr on Friday said in an interview that there would be "hell to pay" if Trump moved to fire Mueller.

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

"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 said.

— Julia Manchester