Michigan State Rep. Jim Lower announced in May that he will be mounting a primary challenge against Rep. Justin Amash over his comments about impeaching President Donald Trump — and the previously little known politician is already polling ahead of the longtime congressman.

Amash made national headlines after he called for the impeachment of President Trump, becoming the first GOP congressman or senator to do so. Soon after his statements, Lower announced that he will be sitting out the race for his third term in the state senate and will instead be running for the 3rd Congressional District seat that Amash has held since 2011.

According to a new poll from Practical Political Consulting, Rep. Amash is now polling 16 points behind his pro-Trump primary challenger, 49-33.

Politico has reported that President Trump is also considering endorsing Lower.

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“Trump has raised the primary challenge idea with Vice President Mike Pence and North Carolina Rep. Mark Meadows, a close Trump ally who co-founded the conservative House Freedom Caucus with Amash. Trump has also addressed the subject with Republican National Committee Chairwoman Ronna McDaniel, a former Michigan GOP leader who remains influential in the state,” Politico reports.

Lower, who is staunchly pro-Trump, said that he had been planning to run for the seat eventually, but decided now is the right time after Amash’s tweets about impeaching the president.

“Congressman Justin Amash tweets yesterday calling for President Trump’s impeachment show how out of touch he is with the truth and how out of touch he is with people he represents,” Lower said, according to a report from the Detroit Free Press. “He must be replaced and I am going to do it.”

Amash has not ruled out running against President Trump in 2020 as the Libertarian Party candidate.