A lawyer who for years represented Rudy Giuliani in a variety of legal matters sued him on Monday.
Robert Costello and his firm, Davidoff Hutcher & Citron LLP, allege in the suit that the former New York City mayor owes them nearly $1.4 million.
The lawsuit claims Costello and the firm represented Giuliani during criminal investigations by the U.S. Attorney for the Southern District of New York, the Fulton County District Attorney's Office, special counsel Jack Smith and during the U.S. House Jan. 6 committee's investigation.
Costello and the law firm also claim to have been involved with litigation surrounding more than 10 lawsuits filed against Giuliani "in various state and federal courts as well as participating in representing the Defendant in disciplinary proceedings regarding his law license in the District of Columbia" and New York.
Giuliani criticized the suit and Costello, who has been a confidant and supporter of the former mayor for decades, in a statement to CBS News.
Told of Giuliani's comment, Costello said in a text message to CBS News, "How can he take a personal affront when he owes my firm $1.4 million? For almost four years he received bills and never complained (and never paid)."
In February, Costello sued Steve Bannon for unpaid legal bills. Bannon, the former White House chief strategist to former President Donald Trump, was ordered by a New York judge in July to pay Costello's firm nearly $500,000.
Trump hosted a $100,000 per plate fundraiser in support of Giuliani on Sept. 7 at his country club in Bedminster, New Jersey. It is unclear how much the event raised for Giuliani personally, but his son, Andrew Giuliani, said on a radio show before the event that he expected to bring in at least $1 million.