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President Trump weighs in on Twitter Sunday about ex-FBI Director James B. Comey and Michael Flynn.

President Trump denied any attempt to obstruct an FBI investigation into former national security adviser Michael Flynn on Sunday, while lawmakers said the president’s own comments raised new questions about him and the probe into Russians who interfered in last year’s presidential election.

During a weekend-long series of tweets following Flynn’s guilty plea for lying to the FBI, Trump attacked the FBI in general and former director James Comey over different aspects of the Russia investigation, including Flynn’s role.

“I never asked Comey to stop investigating Flynn,” Trump tweeted. “Just more Fake News covering another Comey lie!”

Comey testified under oath to Congress after his dismissal that Trump asked him to go easy on Flynn.

Trump further complicated matters by tweeting that he knew Flynn had lied to the FBI when he fired him. Lawmakers said that raises a possible obstruction of justice claim, given Comey’s statement that Trump had asked him to drop the Flynn investigation.

 “I had to fire General Flynn because he lied to the Vice President and the FBI. He has pled guilty to those lies. It is a shame because his actions during the transition were lawful. There was nothing to hide!” the tweet read.

That would mean that, if Trump did ask Comey to drop the Flynn investigation, he did so knowing that his former aide had lied to the FBI.

While Trump denied pressuring Comey, one of his lawyers said he drafted the tweet in question and made a mistake. Attorney John Dowd told USA TODAY that Trump did not know for sure Flynn had lied to the FBI, only that the Justice Department had raised questions about his comments regarding his contacts with Russian Ambassador Sergey Kislyak.

“The point of that tweet was entirely correct,” Dowd said, adding that Flynn did not need to lie about his talks with Kislyak.

Sen. Mark Warner, D-Va., top Democrat on the Senate Intelligence…