President Donald Trump on Sunday suggested that there are more revelations to come from fired FBI Director James Comey, and questioned their legality.

“I believe the James Comey leaks will be far more prevalent than anyone ever thought possible,” Trump tweeted early Sunday morning. “Totally illegal? Very ‘cowardly!'”

I believe the James Comey leaks will be far more prevalent than anyone ever thought possible. Totally illegal? Very 'cowardly!' — Donald J. Trump (@realDonaldTrump) June 11, 2017

Trump made similar remarks on Friday in another early morning tweet where he labeled Comey a “leaker,” referring to Comey’s decision to share the contents of memos about his conversations with Trump to the press via a friend.

Comey revealed that decision during his testimony on Thursday before the Senate Intelligence Committee, where he painted Trump as a liar and testified that Trump tried to obtain a loyalty pledge from the former FBI head and pushed him to drop an investigation into former national security adviser Michael Flynn.

Trump on Friday said he was “100 percent” willing to match Comey and testify under oath to contradict Comey’s testimony.