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 on Thursday again slammed 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's investigation as a "witch hunt" and claimed that prosecutors gave his former national security adviser, Michael Flynn, "a great deal" because they felt badly about how he had been treated.

"They gave General Flynn a great deal because they were embarrassed by the way he was treated - the FBI said he didn’t lie and they overrode the FBI," Trump wrote on Twitter. "They want to scare everybody into making up stories that are not true by catching them in the smallest of misstatements. Sad!"

They gave General Flynn a great deal because they were embarrassed by the way he was treated - the FBI said he didn’t lie and they overrode the FBI. They want to scare everybody into making up stories that are not true by catching them in the smallest of misstatements. Sad!...... — Donald J. Trump (@realDonaldTrump) December 13, 2018

WITCH HUNT! — Donald J. Trump (@realDonaldTrump) December 13, 2018

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Flynn, who served a brief stint as Trump's national security adviser, pleaded guilty to lying about his contacts with the Russian ambassador to the U.S. last December and agreed to cooperate in Mueller’s investigation.

Mueller has described Flynn’s cooperation as valuable. Earlier this week, Flynn asked a federal judge to spare him from prison time and instead sentence him to at most one year probation.

In a memo filed in federal court late Tuesday, Flynn’s defense attorneys also suggested that he had been duped by FBI agents who handled his interview, playing into a theory among conservatives that Flynn had been wrongly led to commit a federal crime.

Mueller has recommended Flynn serve no jail time, citing his “substantial assistance” in the ongoing investigation into Russian interference in the 2016 election. Flynn, who served on the Trump campaign before moving to the White House, is said to have offered the special counsel valuable details about contacts between the campaign and Russia as well as information related to other unknown matters under investigation.

Flynn is scheduled to be sentenced in D.C. federal court on Dec. 18.

Late Wednesday, the judge overseeing his case, U.S. District Judge Emmet G. Sullivan, asked both Flynn and Mueller to turn over additional materials related to Flynn’s January 2017 interview with the FBI in which he later admitted he lied about his Russia contacts.

It is possible but unclear whether the developments could delay Flynn’s sentencing.

Asked later Thursday whether he thought the FBI had acted inappropriately in the case, Trump said it was "a great thing" that the judge was assessing the matter.

"The FBI said Michael Flynn… didn’t lie. And Mueller said, well, maybe he did," Trump told reporters during a meeting with recently elected governors. "But now they are all having a big dispute. So I think it is a great thing that the judge is looking into that situation.”

A report released by Republicans on the House Intelligence Committee earlier this year said top FBI officials testified that the agents who interviewed Flynn in January 2017 did not see outward indications, such as changes in his posture or tone, that indicated he knew he was lying. Flynn has admitted to lying to the FBI agents about his discussions with Kislyak regarding sanctions on Russia among other topics.

One of the agents who interviewed Flynn was Peter Strzok, a former FBI official who has attracted intense scrutiny from Republican lawmakers as a result of text messages he sent before the election in which he expressed criticisms of then-candidate Trump. While conservatives have seized on the messages as evidence of bias at the FBI in the early days of the counterintelligence probe into Russian interference, the Justice Department inspector general has found no evidence that political bias influenced the bureau's decisions.

— This report was last updated at 3:04 p.m.