Rep. Justin Amash Justin AmashInternal Democratic poll shows tight race in contest to replace Amash Centrist Democrats 'strongly considering' discharge petition on GOP PPP bill On The Trail: How Nancy Pelosi could improbably become president MORE (R-Mich.) said Tuesday that President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE’s attack on Rep. Mark Sanford Mark SanfordOn The Money: Business world braces for blue sweep | Federal Reserve chief to outline plans for inflation, economy | Meadows 'not optimistic' about stalemate on coronavirus deal Trump critic Sanford forms anti-debt advocacy group Republicans officially renominate Trump for president MORE (R-S.C.) was “classless.”

“This was a classless cheap shot,” Amash wrote in a tweet, referring to reports that the president criticized the congressman during a meeting on Capitol Hill on Tuesday.

This was a classless cheap shot. https://t.co/uatCw7qwGV — Justin Amash (@justinamash) June 19, 2018

Trump reportedly called Sanford a “nasty guy” during his meeting with congressional Republicans, which was ostensibly focused on immigration.

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Trump’s comments come just one week after Sanford lost his primary bid to state Rep. Katie Arrington (R), an ardent supporter of the president.

Trump had attacked Stanford just a few hours before the polls closed in the congressman’s district last Tuesday. In his tweet, Trump referenced Sanford’s 2009 affair with an Argentine woman.

“Mark Sanford has been very unhelpful to me in my campaign to MAGA. He is MIA and nothing but trouble. He is better off in Argentina,” Trump tweeted. “I fully endorse Katie Arrington for Congress in SC, a state I love. She is tough on crime and will continue our fight to lower taxes. VOTE Katie!”

Sanford has criticized Trump in the past and said on Sunday that he lost his primary bid because he wasn’t “Trump enough.”

"People are running for cover because they don't want to be on the losing side of a presidential tweet," the South Carolina Republican told NBC’s "Meet the Press" on Sunday. “The idea that you can't speak out and say, ‘I disagree with you here, but I agree with you on 90 percent of the stuff’ ... is, again, a twilight world that I've never seen."