Sen. Richard Blumenthal (D-Conn.) said Monday 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 personal lawyer should resign if he wants to take responsibility for drafting a heavily scrutinized Trump tweet about the reason former national security adviser Michael Flynn was fired.

“The attempt by John Dowd to take the fall here is really ludicrous. First of all, when has anyone ever put words in Donald Trump’s mouth? And second, no matter who drafted it, it’s Donald Trump’s words,” Blumenthal said on MSNBC's “Morning Joe.”

“And if John Dowd truly wants to take responsibility, he has to resign from the president’s legal team,” Blumenthal added.

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Trump caused a stir on Saturday when he tweeted, "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!" he added.

Flynn pleaded guilty on Friday to lying to federal investigators about his conversations during the presidential transition with the Russian ambassador to the U.S. about sanctions related to the Kremlin’s election interference.

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.

Dowd on Sunday took responsibility for drafting the tweet, saying it was “my mistake.”

Blumenthal on Sunday said “Trump’s tweets are HIS words,” calling the Flynn tweet “stunning evidence of obstruction of justice.”