NEW YORK (CBSNewYork) — Mayor Bill de Blasio will be questioned by federal prosecutors and the FBI on Friday, CBS2 has confirmed.

CBS2 Political Reporter Marcia Kramer confirmed through multiple sources Thursday night that de Blasio will be interviewed about the fundraising scandal that has swirled around the Mayor’s office for nearly a year.

The meeting will take place at the office of de Blasio’s attorney, Barry H. Berke of Kramer, Levin, Naftalis & Frankel, Kramer confirmed.

As CBS2’s Dick Brennan reported, sources said de Blasio’s team has agreed to meet with prosecutors for four hours tomorrow to answer questions.

CBS2 is told the interview was set originally set for two weeks ago, but was postponed until Friday.

The mayor has been preparing for the interview for the past two days, meeting with his lawyer for five hours Thursday and about three hours Wednesday, sources said.

De Blasio will be questioned on more than a dozen topics, sources said.

The mayor is set to fly to Atlanta after the interview to attend the Democratic National Committee winter meeting.

A federal probe is looking into whether the mayor and his aides gave favorable treatment to donors who contributed to his 2013 mayoral run. The donors in question reportedly include Harendra Singh and his city lease for the Water’s Edge restaurant in Queens and real estate investor Jona Rechnitz.

De Blasio has repeatedly denied any wrongdoing, saying everything was done with the advice of his legal team.

CBS2 has been staking out the offices for de Blasio’s attorneys for the past several days as he has arrived and left.

CBS2 has reached out to the Mayor’s office for a response. They said they have no comment.

Last December, de Blasio was fined nearly $48,000 for violating spending rules during his 2013 campaign for mayor.