Donald Trump Brands Rep. Justin Amash a 'Loser' After GOP Lawmaker Said Trump Engaged in 'Impeachable' Conduct

President Donald Trump wasted no time blasting Congressman Justin Amash, who on Saturday became the first Republican representative to publicly argue that Trump engaged in impeachable conduct while in the Oval Office.

True to form, Trump railed on his favorite medium and sent out a string of fiery tweets Sunday morning.

"Never a fan of [Justin Amash], a total lightweight who opposes me and some of our great Republican ideas and policies just for the sake of getting his name out there through controversy," the president wrote. "If he actually read the biased Mueller Report, 'composed' by 18 Angry Dems who hated Trump, he would see that it was nevertheless strong on NO COLLUSION and, ultimately, NO OBSTRUCTION…"

He continued, "Justin is a loser who sadly plays right into our opponent's hands!"

Trump's remarks came after Amash unveiled a lengthy Twitter thread of his own on Saturday, in which the Michigan lawmaker wrote that he had, in fact, read the full, redacted Mueller report into election meddling and potential obstruction of justice by the Trump administration. The report, released in April, outlined 10 possible instances in which Trump may have obstructed justice but forwarded reaching a determination on charges to Attorney General William Barr, who declined to indict.

A careful reading of the documents, Amash said, led him to conclude that Barr deliberately misrepresented the report's findings and that Trump engaged in impeachable conduct. He also surmised that few members of Congress had read the report, and that "partisanship has eroded our system of checks and balances."

"We've witnessed members of Congress from both parties shift their views 180 degrees—on the importance of character, on the principles of obstruction of justice—depending on whether they're discussing Bill Clinton or Donald Trump," Amash wrote. "Few members of Congress even read Mueller's report; their minds were made up based on partisan affiliation—and it showed, with representatives and senators from both parties issuing definitive statements on the 448-page report's conclusions within just hours of its release."

All told, the thread amounted to a stinging rebuke of a sitting president from a member of his own party. Newsweek has reached out to Amash for further comment.

The Twitter thread quickly went viral, earning accolades from those who said it was refreshing to see a politician abandon partisanship.

On Sunday, Utah Senator and one-time Republican presidential nominee Mitt Romney called Amash's public display "courageous," but insisted he didn't believe that moving forward with impeachment amounted to the best course of action.

"I respect him, I think it's a courageous statement, but I believe that to make a case for obstruction of justice you just don't have the elements that are evidenced in this document," Romney opined during an appearance on CNN's State of the Union. "And I also don't believe that an impeachment call is not only something that relates to the law but considers practicality and politics, and the American people just aren't there."

Other prominent Republicans—including Republican National Committee Chairwoman Ronna McDaniel—took a harsher approach and slammed Amash for seemingly siding with Democrats.

"Voters in Amash's district strongly support this President, and would rather their Congressman work to support the President's policies that have brought jobs, increased wages and made life better for Americans," she wrote on Twitter.

If Democrats were to currently pursue impeachment proceedings to oust Trump from office, the efforts would likely be futile unless other conservative lawmakers join Amash's disavowal. Removing a sitting president requires the approval of two-thirds of the Senate, where the GOP holds a slender 53-47 majority.

Ranking Democrat Nancy Pelosi, who would theoretically oversee impeachment proceedings as House Speaker, has further said the process sows division and would not be politically expedient, regardless of whether Trump's behavior warrants the charges.

"Impeachment is, to me, divisive," Pelosi previously said, noting that she wouldn't rule it out. "Again, if the facts are there, then this would have to be bipartisan to go forward. But if it is viewed as partisan, it will divide the country, and I just don't think that's what we should do."