The man who allegedly gunned down a leader of the Gambino crime family earlier this year was obsessed with internet conspiracy theories like QAnon and believed he was working to aid President Donald Trump, The New York Times reported on Sunday.

Attorneys for Anthony Comello, 24, have argued in court documents that their client intended to conduct a citizen’s arrest of Francesco “Franky Boy” Cali during a late-night encounter in March. Instead, the pair spoke outside Cali’s home on Staten Island, and when the mob boss resisted arrest, Comello shot him 10 times.

Now, Comello’s defense lawyer plans to argue that his client is not guilty of murder due by reason of mental defect, saying the man was so obsessed with conspiracy theories that he should be held in a psychiatric facility rather than be prosecuted.

Comello is currently being held in protective custody ahead of his trial.

“He ardently believed that Francesco Cali, a boss in the Gambino crime family, was a prominent member of the deep state, and, accordingly, an appropriate target for a citizen’s arrest,” Robert Gottlieb, Comello’s attorney, wrote in the documents obtained by the Times. “Mr. Comello became certain that he was enjoying the protection of President Trump himself, and that he had the president’s full support.”