Former FBI Director James Comey James Brien ComeyTrump jabs at FBI director over testimony on Russia, antifa Graham: Comey to testify about FBI's Russia probe, Mueller declined invitation Barr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' MORE on Monday called on Republicans to speak out against "witness intimidation" hours after President Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE labeled the former bureau leader a "dirty cop."

"This is not okay, not normal," Comey tweeted. "That the witness intimidation continues while hundreds of thousands of honest public servants are without pay moves it from just outrageous to unconscionable. Can Republicans hear the past asking, 'At long last, have you left no sense of decency?'"

This is not okay, not normal. That the witness intimidation continues while hundreds of thousands of honest public servants are without pay moves it from just outrageous to unconscionable. Can Republicans hear the past asking, “At long last, have you left no sense of decency?” — James Comey (@Comey) January 14, 2019

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Comey, who has regularly criticized the president and Republicans for their attacks on the Justice Department, did not specify the impetus for his tweet, but it came hours after President Trump blasted the former FBI chief and other bureau agents as he denied that he worked for Russia.

The president offered his most direct denial to date of a New York Times story that said the FBI officials were so concerned about Comey's firing that they opened an investigation regarding the possibility that Trump was a Russian agent.

"Not only did I never work for Russia, I think it's a disgrace that you even asked that question because it's a whole big fat hoax,” Trump told reporters outside the White House.

He went on to decry Comey as a "dirty cop," and blasted agents conducting the investigation as "known scoundrels."

Comey's firing precipitated 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's appointment as special counsel. The president has repeatedly ripped Mueller's investigation into Russian interference in the 2016 election as a "witch hunt."

The president also drew criticism over the weekend when he suggested his former personal attorney, Michael Cohen, should "give information maybe on his father-in-law" during his upcoming congressional testimony. Cohen was sentenced to three years in prison in part for crimes he said he committed at Trump's direction.

Democrats seized on the comments to warn against witness intimidation.