Amash responds to Trump Jr. primary threat with Russia joke

Rep. Justin AmashJustin AmashSunday shows — Mulvaney seeks to tamp down firestorm over quid pro quo comments, Doral decision Amash rips Trump over move to send troops from Syria to Iraq Amash: Clinton's attack on Gabbard will 'drive many people into the arms' of Trump MORE (R-Mich.) hit back at Donald Trump Jr.Donald (Don) John TrumpDOJ: McGahn, Trump Jr. did not testify before Mueller grand jury Clothing company erects billboard of Marine Corps vet hogtying Trump in front of White House Dem committee chairs blast Trump G-7 announcement MORE on Thursday after the president’s eldest son hinted he may campaign with Amash’s primary challenger.

“If it's what you say I love it especially later in the summer,” Amash responded on Twitter.

Amash was alluding to a comment Trump Jr. made in response to a Russian lawyer offering damaging information on Democratic rival Hillary ClintonHillary Diane Rodham ClintonClinton trolls Trump with mock letter from JFK to Khrushchev Trump-Graham relationship tested by week of public sparring Sunday shows — Mulvaney seeks to tamp down firestorm over quid pro quo comments, Doral decision MORE during the 2016 election.

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The Michigan Republican dug up the remark to use against Trump Jr. after the president’s son threatened to campaign against Amash following a new poll this week showing the libertarian-leaning lawmaker trailing a little-known GOP challenger by 16 points.

"Michigan is beautiful during primary season," tweeted Trump Jr., who has campaigned for Republicans across the country and appeared at several rallies during the midterms last year.

Amash has become a virtual pariah among the GOP after he said President TrumpDonald John TrumpZuckerberg launches public defense of Facebook as attacks mount Trump leaning toward keeping a couple hundred troops in eastern Syria: report Warren says making Israel aid conditional on settlement building is 'on the table' MORE engaged in impeachable conduct, citing several instances detailed by special counsel Robert MuellerRobert (Bob) Swan MuellerFox News legal analyst says Trump call with Ukraine leader could be 'more serious' than what Mueller 'dragged up' Lewandowski says Mueller report was 'very clear' in proving 'there was no obstruction,' despite having 'never' read it Fox's Cavuto roasts Trump over criticism of network MORE of potentially obstructive behavior. 

The Michigan Republican this week left the House Freedom Caucus, which he help found, and was slammed as a “loser” by the president last month.

He now faces a primary challenge from state Rep. James Lower, who has tied himself closely to the White House.

Politico reported Wednesday that the president has considered backing Lower or another challenger and has discussed the prospect with top members of the party, including Republican National Committee Chairwoman Ronna Romney McDaniel.

“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,” McDaniel said in a statement Wednesday.