Rep. Justin Amash Justin AmashInternal Democratic poll shows tight race in contest to replace Amash Centrist Democrats 'strongly considering' discharge petition on GOP PPP bill On The Trail: How Nancy Pelosi could improbably become president MORE (R-Mich.) on Monday doubled down on his critical remarks of President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE, detailing in a series of tweets why he thinks the case can be made that Trump should be impeached for obstruction of justice.

"People who say there were no underlying crimes and therefore the president could not have intended to illegally obstruct the investigation—and therefore cannot be impeached—are resting their argument on several falsehoods," Amash tweeted.

ADVERTISEMENT

In a series of subsequent tweets, Amash sought to shoot down a number of prominent defenses of the president's behavior illustrated in special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE's report.

Amash argued it would be inaccurate to say "there were no underlying crimes" revealed by Mueller's investigation, that obstruction of justice requires an underlying crime, that the president should be allowed to use any means to end a so-called frivolous investigation, and that the threshold of "high crimes and misdemeanors" requires actual criminal charges.

1. They say there were no underlying crimes. — Justin Amash (@justinamash) May 20, 2019

2. They say obstruction of justice requires an underlying crime. — Justin Amash (@justinamash) May 20, 2019

If an underlying crime were required, then prosecutors could charge obstruction of justice only if it were unsuccessful in completely obstructing the investigation. This would make no sense. — Justin Amash (@justinamash) May 20, 2019

In fact, the president could not have known whether every single person Mueller investigated did or did not commit any crimes. — Justin Amash (@justinamash) May 20, 2019

In fact, “high Crimes and Misdemeanors” is not defined in the Constitution and does not require corresponding statutory charges. The context implies conduct that violates the public trust—and that view is echoed by the Framers of the Constitution and early American scholars. — Justin Amash (@justinamash) May 20, 2019

Amash on Saturday became the first Republican lawmaker to say Trump engaged in "impeachable conduct." The House Freedom Caucus member concluded after reading Mueller's 448-page report that it showed "multiple examples of conduct satisfying all the elements of obstruction of justice."

Trump promptly returned fire on Sunday, calling Amash a "loser" and a "total lightweight" and accusing him of making the comments "for the sake of getting his name out there through controversy."

The president has maintained that Mueller's investigation found "no collusion and no obstruction." The special counsel did not establish the Trump campaign conspired with the Russian government, and Mueller neither implicated nor exonerated the president on obstruction charges, leaving the matter up to Congress for further investigation.

House Minority Leader Kevin McCarthy Kevin Owen McCarthyMcCarthy threatens motion to oust Pelosi if she moves forward with impeachment Kate Schroder in Ohio among Democratic challengers squelching GOP hopes for the House McCarthy's Democratic challenger to launch first TV ad highlighting Air Force service as single mother MORE (R-Calif.) on Sunday suggested Amash made the claim to get attention and noted the congressman's tendency to buck the party on legislative votes.

“It’s a question whether he’s even in our Republican conference as a whole,” McCarthy said on Fox News. “What he wants is attention in this process. He’s not a criminal attorney. He’s never met Mueller. He’s never met [Attorney General William] Barr. Now he’s coming forward with this because this is what he wants.”

Michigan state Rep. Jim Lower (R) said Monday morning he would challenge Amash in a GOP primary for the 3rd Congressional District nomination.

Amash has represented the district since 2011. He won reelection last year with 54 percent of the vote.