The legal team of former national security adviser Michael Flynn is reportedly no longer sharing information with attorneys for President Trump, a move that commonly happens when an investigation target starts cooperating with prosecutors.

In its report Thursday, The New York Times cited “four people involved in the case” as saying that Mr. Flynn’s attorneys had “notified the president’s legal team in recent days that they could no longer discuss” the investigation of Special Counsel Robert S. Mueller.

Mr. Mueller is probing the Trump team’s ties to Russian officials and its possible involvement in Kremlin efforts to influence the 2016 U.S. presidential election.

Mr. Flynn, who resigned the NSC chief post just a couple months into Mr. Trump’s administration, is widely known as the most legally vulnerable Trump insider.

The Times cautioned that the termination of information-sharing isn’t proof that Mr. Flynn either has cut a plea deal with prosecutors or is trying to do so — and presumably cooperating with them as a condition of the deal.

“Defense lawyers frequently share information during investigations, but they must stop when doing so would pose a conflict of interest. It is unethical for lawyers to work together when one client is cooperating with prosecutors and another is still under investigation,” wrote reporters Michael S. Schmidt, Matt Apuzzo and Maggie Haberman.

The Times had no official comment from either the Trump or Flynn legal teams.

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