A campaign aide for former President Obama said Sunday that President Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE’s use of Twitter could be his undoing.

“Having a full-out meltdown on Twitter is not helping his case. Generally if you’re doing all caps and exclamation points, it is the opposite of inspiring confidence,” Lis Smith, former director of rapid response for Obama's campaign, said on MSNBC.

“What’s sort of ironic about this whole thing is Donald Trump always likes to say Twitter helped make him become president, but Twitter could actually now be the undoing of his presidency,” she continued.

Spoke w/@davidgura about how @realdonaldTrump's use of twitter, once seen as a strength, is turning into serious liability w/r/t investigations https://t.co/hZYhmKatOK — Lis Smith (@Lis_Smith) December 3, 2017

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Trump’s tweets have come under particular scrutiny after former national security adviser Michael Flynn pleaded guilty to lying to the FBI.

"I had to fire General Flynn because he lied to the Vice President and the FBI. He has pled guilty to those lies," Trump tweeted on Saturday.

"It is a shame because his actions during the transition were lawful. There was nothing to hide!" he added.

The tweet caused shockwaves, as legal experts suggested that if Trump knew that Flynn had lied to the FBI and then asked James Comey to drop the investigation, as the former FBI director has testified to Congress, it could amount to obstruction of justice.

Trump's personal lawyer, John Dowd, reportedly wrote the tweet, and on Sunday said it was "my mistake."

On Sunday morning, Trump again took to Twitter to lash out, this time at the FBI. He said the bureau's reputation is in "tatters" because of Comey, whom Trump fired in May.