Rep. Justin Amash's tweets declaring that President Trump committed impeachable offenses have made him an outcast among Republicans, but many of his supporters are excited about what they see as a sign he will run for president as a Libertarian. The Michigan Republican, 39, is known for defying party leaders on issues such as mass surveillance and government spending. And since Trump took office, he’s been viewed as a possible Libertarian champion in 2020 — a notion amplified by his Saturday remarks. Amash’s emergence as a possible competitor may have caught Trump’s campaign off-guard.