Cohen's lawyers had been scrambling to meet federal Judge Kimba Wood's Friday deadline to complete a review of over 3.7 million documents seized in the April 9 raids of Cohen's NY home, office and hotel room, the network reported.
Daniels' lawyer, Michael Avenatti, who is suing him in an attempt to get the actress released from a confidentiality agreement, gloated over the news in a tweet.
It's unclear if who will represent Cohen moving forward.
Porn Star Stormy Daniels is paying for her legal defense through a crowd-funded site
Law&Crime reached out to both Mr. Ryan and Mr. Harrison for comment, but they did not immediately respond.
The split could signal a shift in legal strategy and comes amid mounting pressure on Cohen as criminal charges could become likely. For several months now, the prosecutors have been looking into whether Cohen broke the law in any business projects, including hush-money payments he made to women who claim they had affairs with Trump. While the Journal's sources report that Cohen has not decided whether to cooperate, ABC reports that he will.
McDermott Will & Emery, a NY and Washington firm, has been representing Mr. Cohen. He hasn't been charged with any crime.
Cohen, ABC News reported, is no longer represented by Stephen Ryan and Todd Harrison of the Washington and NY firm McDermott, Will & Emery, and no replacement has been identified.
Trump has repeatedly said there was no collusion, and Russian Federation has denied interference.