There is every indication he is in good standing in his district.
May 19, 2019
Rep. Justin Amash of Michigan (click here) became the first Republican lawmaker to say President Trump had "engaged in impeachable conduct." In a series of tweets on Saturday, Amash wrote he had read the full report by special counsel Robert Mueller and had concluded the president's conduct met the "threshold for impeachment."...
...After Mueller concluded his report in mid-March, Attorney General William Barr released a four-page summary, which Amash said "deliberately misrepresented" the full 448-page report. "Barr's misrepresentations are significant but often subtle, frequently taking the form of sleight-of-hand qualifications or logical fallacies, which he hopes people will not notice," he wrote.
Amash wrote that, contrary to Barr's initial assessment of Mueller's report, Mr. Trump had "engaged in specific actions and a pattern of behavior that meet the threshold for impeachment.
Congress, too, was not spared from criticism by Amash. He called out the partisanship of many lawmakers, saying they shift their perceptions "180 degrees" when discussing former President Bill Clinton and Mr. Trump.
"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," Amash wrote....
He held a town hall after calling for Trump's impeachment and he was supported by his constituency.