Amash responds to Trump Jr. primary threat with Russia joke

Rep. Justin AmashJustin AmashOvernight Defense: Foreign policy takes center stage at Democratic debate | House delivers impeachment articles to Senate | Dems vow to force new vote on Trump's border wall House votes to send impeachment articles to Senate Amash: Trump claim about US embassy threats 'seems to be totally made up' MORE (R-Mich.) hit back at Donald Trump Jr.Donald (Don) John TrumpComedians post fake Army recruitment posters featuring Trump Jr. Trump Jr., Ivanka garner support in hypothetical 2024 poll FWS: There's 'no basis' to investigate Trump Jr.'s Mongolian hunting trip 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 ClintonFormer Vermont Governor: Sanders 'will play dirty' NYT: Justice investigating alleged Comey leak of years-old classified info New Hampshire state lawmaker switches support from Warren to Klobuchar 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 TrumpLev Parnas implicates Rick Perry, says Giuliani had him pressure Ukraine to announce Biden probe Saudi Arabia paid 0 million for cost of US troops in area Parnas claims ex-Trump attorney visited him in jail, asked him to sacrifice himself for president MORE engaged in impeachable conduct, citing several instances detailed by special counsel Robert MuellerRobert (Bob) Swan MuellerSchiff: Trump acquittal in Senate trial would not signal a 'failure' Jeffries blasts Trump for attack on Thunberg at impeachment hearing Live coverage: House Judiciary to vote on impeachment after surprise delay 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.