The lawsuit filed Thursday in New York state court claims the Trump Organization stopped paying Cohen’s mounting legal fees after he began co-operating with federal prosecutors.
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It alleges breach of contract and seeks damages on Cohen’s behalf.
Messages seeking comment have been left with the Trump Organization.
The lawsuit says the company stopped paying for his legal defence about two months after the FBI raided Cohen’s home and office.
Cohen pleaded guilty in August to tax crimes, lying to Congress and campaign finance violations.