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In a May Twitter thread, Amash laid out his own \"principal conclusions\" from the 448-page Mueller report, including that \"Attorney General [William] Barr has deliberately misrepresented Mueller's report,\" and that \"President Trump has engaged in impeachable conduct.\"

Here are my principal conclusions:
1. Attorney General Barr has deliberately misrepresented Mueller’s report.
2. President Trump has engaged in impeachable conduct.
3. Partisanship has eroded our system of checks and balances.
4. Few members of Congress have read the report.

— Justin Amash (@justinamash) May 18, 2019

The special counsel did not establish that the Trump campaign or anyone associated with it conspired or coordinated with Russia. He also provided no conclusion on the matter of possible obstruction of justice, choosing instead to leave that decision for Congress.

Trump responded in a tweet at that time, saying he was \"never a fan\" of Amash.

Never a fan of @justinamash, 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. If he actually read the biased Mueller Report, “composed” by 18 Angry Dems who hated Trump,....

— Donald J. Trump (@realDonaldTrump) May 19, 2019

Amash renouncing his ties to the Republican Party could have implications on Capitol Hill. He could potentially lose his membership in the Republican conference as well as his seat on the House Oversight Committee, which has investigative powers over government activities, including open lawsuits and investigations against Trump and his administration.

Running for re-election as independent could also pave the way for another Republican to run with the party’s nomination for his House seat in 2020.

A pro-Trump Michigan state Rep. Jim Lower had already launched a primary challenge against Amash, and the president's son, Donald Trump Jr. hinted a few weeks ago that he would campaign against the former Michigan Republican.

Other congressional Republicans have come after Amash and defended the president, while he has been winning praise from Democrats, who see Amash as the first break in the GOP opposition to possible impeachment, allowing them to claim the effort is bipartisan.

Amash left the conservative House Freedom Caucus last month.

ABC News' Benjamin Siegel contributed to this report.

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