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 tore into James Comey James Brien ComeyDemocrats fear Russia interference could spoil bid to retake Senate Book: FBI sex crimes investigator helped trigger October 2016 public probe of Clinton emails Trump jabs at FBI director over testimony on Russia, antifa MORE on Thursday night, hours after the former FBI director suggested in a wide-ranging CNN town hall that he be prosecuted.

Trump knocked Comey in a tweet as "a disgrace to the FBI" while predicting that he "will go down as the worst Director in its long and once proud history."

"He brought the FBI down, almost all Republicans & Democrats thought he should be FIRED, but the FBI will regain greatness because of the great men & women who work there!" he added.

James Comey is a disgrace to the FBI & will go down as the worst Director in its long and once proud history. He brought the FBI down, almost all Republicans & Democrats thought he should be FIRED, but the FBI will regain greatness because of the great men & women who work there! — Donald J. Trump (@realDonaldTrump) May 9, 2019

ADVERTISEMENT The remarks were the latest salvo in the pair's fractious relationship and came exactly two years after Trump fired Comey, the law enforcement official who at the time was leading the federal probe into the Trump campaign and Russian interference in the 2016 election.

Comey said during the appearance that he had "no doubt" Trump would have been charged with obstruction if he were not president, adding that the Justice Department would have to take a "serious look" at whether to pursue charges after he leaves office.

"Whether it's a wise thing to do to a former president, I don't know, that's a harder question — a much bigger question — than the facts of the case," Comey said.