A new report from the New York Times offers the clearest evidence yet that former Trump National Security Adviser Michael Flynn is getting ready to cooperate with special counsel Robert Mueller’s probe.

According to the Times, Flynn’s lawyers have “notified the president’s legal team in recent days that they could no longer discuss the special counsel’s investigation.” Flynn’s attorneys had been sharing information with President Donald Trump’s legal team about Mueller’s probe into Russian interference in the 2016 presidential election, but the Times’ sources say that agreement has been terminated.

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“Defense lawyers frequently share information during investigations, but they must stop when doing so would pose a conflict of interest,” the Times writes. “It is unethical for lawyers to work together when one client is cooperating with prosecutors and another is still under investigation.”

While the termination of the information-sharing agreement does not necessarily mean that Flynn has flipped, it does mean that Flynn’s lawyers are at least starting to negotiate with prosecutors.

Speculation about Flynn cooperating with Mueller’s prove spiked last month when the special counsel hit former Trump campaign chairman Paul Manafort with an indictment that included money laundering allegations. There have also been reports that Flynn is concerned about his son, Michael Flynn Jr., being in legal jeopardy thanks to his actions in the 2016 presidential campaign.