Amash responds to Trump Jr. primary threat with Russia joke

Rep. Justin AmashJustin AmashAmash responds to 'Send her back' chants at Trump rally: 'This is how history's worst episodes begin' GOP House campaign chair condemns 'send her back' chants: 'There's no place for that kind of talk' Trump primary challenger Bill Weld responds to rally chants: 'We are in a fight for the soul of the GOP' MORE (R-Mich.) hit back at Donald Trump Jr.Donald (Don) John TrumpThe Hill's Morning Report — Trump retreats on census citizenship question Trump set to host controversial social media summit Trump associate Felix Sater grilled by House Intel 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 ClintonHillary Clinton slams Trump rally: 'The time has come again' to fight for democracy Trump blasts minority Democrats, rally crowd chants 'send her back' The Memo: Democrats debate Trump response – 'Being righteous and losing sucks' 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 TrumpAmash responds to 'Send her back' chants at Trump rally: 'This is how history's worst episodes begin' McConnell: Trump 'on to something' with attacks on Dem congresswomen Trump blasts 'corrupt' Puerto Rico's leaders amid political crisis MORE engaged in impeachable conduct, citing several instances detailed by special counsel Robert MuellerRobert (Bob) Swan MuellerTop Republican considered Mueller subpoena to box in Democrats Kamala Harris says her Justice Dept would have 'no choice' but to prosecute Trump for obstruction Dem committees win new powers to investigate Trump 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.