Donald Trump called his former FBI director a “leaker” on Friday, one day after James Comey testified under oath that the president lied about his firing and the FBI in an effort to undermine the agency’s investigation into possible collusion between the Trump campaign and Russia.

Trump’s legal team was confirmed to be preparing to file a complaint against Comey, for sharing his memos of meetings with the president with the New York Times.

“Despite so many false statements and lies, total and complete vindication ... and WOW, Comey is a leaker!” Trump tweeted in his first public comments on Thursday’s Senate intelligence committee hearing, bringing to a close an unusually prolonged silence for a president whose first line of defense is often expressed in 140 characters or less.