Michael Cohen, President Donald Trump's former personal attorney and fixer, exits federal court after his sentencing hearing, December 12, 2018 in New York City. (Photo by Eduardo Munoz Alvarez/Getty Images)
New York CNN  — 

Less than a month before he is set to testify in front of Congress, Michael Cohen, President Donald Trump’s former personal attorney, has shaken up his legal team.

Cohen, who has been subpoenaed to testify in mid-February by the Senate Intelligence Committee, will be represented by attorneys Michael Monico, a former federal prosecutor in the Northern District of Illinois, and his law partner, Barry Spevack, according to a statement from Cohen’s legal consultant and spokesman, Lanny Davis.

Since last summer, Cohen had been represented by Guy Petrillo, a criminal-defense attorney with strong ties to the Manhattan US Attorney’s Office, where he had worked as the chief of the criminal division. That office investigated and charged Cohen with eight counts including tax fraud and campaign finance violations.

Cohen, who was also subsequently charged with lying to Congress by special counsel Robert Mueller’s office, pleaded guilty to all charges by both offices. He is scheduled to report to prison for a three-year sentence on March 6.

It was not clear exactly why Cohen replaced his legal team, but the relationship between Cohen and Petrillo had been unraveling for some time, according to a source with knowledge of the dynamic between the two men, and had devolved to a “forced marriage.”

Petrillo declined to comment Monday on the circumstances of his departure.

Despite his upcoming incarceration, Cohen has fielded continued interest from Congress and a variety of prosecutors’ offices for his testimony and other forms of assistance. Prior to being subpoenaed by the Senate committee, Cohen was scheduled to testify voluntarily before the House Oversight Committee next week. He said last week, however, that he would postpone that appearance, citing threats to his family from Trump and Trump’s attorney Rudy Giuliani.

In his statement Monday, Davis said Cohen’s newly installed legal team would handle his representation “as he continues to cooperate” with the special counsel, the Manhattan US Attorney’s Office, the New York State Attorney General’s Office and Congress.

“We look forward to helping Mr. Cohen fulfill what he has told us is his only mission – to tell the truth as he knows it and to turn the corner on his past life and taking ownership for his past mistakes by cooperating as best as he can with all governmental authorities in search of the truth,” Monico and Spevack said.

This story has been updated.

CNN’s Gloria Borger contributed to this report.