Michael Cohen, the former personal lawyer of U.S. President Donald Trump, on Thursday sued the Trump Organization, saying it reneged on its obligation to reimburse him for millions of dollars of legal fees and costs related to his work.

In a complaint filed in the New York state supreme court in Manhattan, Cohen said the Trump Organization stopped paying him last May after it became clear he would cooperate with various probes into his work.

These include Special Counsel Robert Mueller’s investigation of Russian influence in the 2016 U.S. presidential election, as well as multiple congressional probes.

Cohen said the Trump Organization owes him at least $3.8 million (£2.9 million), and its failure to pay breached a reimbursement agreement that predated his cooperation.

The Trump Organization did not immediately respond to requests for comment.

Thursday’s lawsuit marks a further break for Trump’s longtime “fixer” from his former boss.

It came as Cohen, 52, prepares this spring to begin serving a three-year prison term following his guilty plea to campaign finance violations.

These included “hush money” payments to adult film actress Stormy Daniels, whose real name is Stephanie Clifford, and former Playboy model Karen McDougal, who both said they had sexual encounters with Trump.

The president has denied their claims. He has also said his campaign did not collude with Moscow.

According to the complaint, Cohen entered the July 2017 reimbursement agreement when he and the Trump Organization were pursuing a “joint defence” to various investigations.

The organisation reaffirmed its payment obligations in December 2017 after Cohen complained to Trump’s adult sons Donald Jr. and Eric, who both worked there, about “repeated delays,” according to the complaint.

Cohen said he has employed at least seven law firms in the last year on matters related to Trump.

He said these include two lawsuits by Daniels, the lawsuit by New York’s attorney general involving Trump’s namesake charity, the Mueller and congressional probes, and his criminal case.

Mistakes made, no rules broken: Trudeau

The alleged missed reimbursements include $1.9 million for legal fees and costs, plus another $1.9 million that Cohen owes in his criminal case.

Cohen this week completed meetings with congressional investigators looking into Trump’s activities.

Testifying on Feb. 27 before the House Committee on Oversight and Government Reform, Cohen called Trump a “con man” and “cheat,” but offered no direct evidence that Trump or his campaign colluded with Moscow in the 2016 election.