Lanny Davis, an adviser and former attorney for Michael Cohen, said Thursday that he believes his former client was forthcoming with 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 about matters involving 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.

Davis said on Fox News that Cohen spent "70 hours at seven different sessions" with Mueller's team of investigators discussing "President Trump and collusion and the core issues" of the special counsel's investigation into Russian interference in the 2016 election.

"I doubt there was anything that was held back about those core issues, or Mr. Mueller wouldn’t have been as complimentary as he was," Davis said.

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He was referencing comments from Mueller in a legal filing last week in which the special counsel said Cohen went to "significant lengths" to assist the investigation, and provided "useful information" relevant to its core issues.

Mueller did not take a position on what sentence Cohen should serve for his crimes.

Davis, who is also an opinion contributor for The Hill, appeared on "America's Newsroom" a day after Cohen was sentenced to three years in prison for crimes including bank fraud, tax fraud and campaign finance violations he said he committed at Trump's direction when he paid two women to keep quiet about alleged affairs with the president.

Cohen also pleaded guilty to lying to Congress about plans to build a Trump property in Moscow.

At his sentencing, Cohen said he took "full responsibility for each act that I pled guilty to, the personal ones to me and those involving the president of the United States of America."

Davis said Thursday that he expects Cohen will testify before Congress at some point, but not before Mueller wraps up his investigation.

"He won’t do anything until Mr. Mueller is done with his work and his report," Davis said. "But the answer I’ve said publicly is that when the time comes, if he’s invited to tell the truth about Mr. Trump, probably to Congress, I believe — I can’t be certain — that he’ll say yes."

Trump on Thursday morning addressed Cohen's sentencing for the first time, denying that he ordered his longtime attorney to break the law.

"He was a lawyer and he is supposed to know the law. It is called ‘advice of counsel,’ and a lawyer has great liability if a mistake is made. That is why they get paid," Trump tweeted.

He also insisted that the payments did not break campaign finance laws and, even if they did, "I did nothing wrong.”