President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE on Monday lashed out at American Federation of Labor and Congress of Industrial Organizations (AFL-CIO) President Richard Trumka a day after the labor union leader criticized Trump's trade deal in a Fox News interview.

Trump, in a Labor Day morning tweet, claimed that Trumka doesn't share the same critique of Trump's trade deal when "he is with me at the White House."

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"Just watched AFL-CIO President Richard Trumka on @FoxNews and thought to myself how different he is on TV than he is when he is with me at the White House. Likes what we are doing until the cameras go on," Trump tweeted.

The president targeted the AFL-CIO head after Trumka said that unions were not ready to back the president's "unenforceable" replacement for the North American Free Trade Agreement (NAFTA).

"We got robbed on Trade and everything else while his Dems just sat back and watched. NAFTA is the worst Trade Deal ever made - terrible for labor - and Richard let it stand. No wonder unions are losing so much. The workers will vote for me in 2020 (lowest unemployment, most jobs ever), and should stop paying exorbitant $Dues, not worth it!"

....and watched. NAFTA is the worst Trade Deal ever made - terrible for labor - and Richard let it stand. No wonder unions are losing so much. The workers will vote for me in 2020 (lowest unemployment, most jobs ever), and should stop paying exorbitant $Dues, not worth it! — Donald J. Trump (@realDonaldTrump) September 2, 2019

"An unenforceable trade deal is a windfall for corporations and a disaster for workers," Trumka said Sunday of the proposed United States–Mexico–Canada Agreement.

He also criticized Trump's handling of China, saying that taking on the nation "has to be a multilateral approach. … One country can’t take on China."

The White House and Trump have pushed back on claims that the tariffs on Chinese goods will hurt consumers or farmers, arguing they it will impact only China.

In a response to Trump's tweets, AFL-CIO spokesperson John Weber said the labor group wouldn't back down to Trump.

"We’ve been clear on what working people want, in private and in public. It’s our job to tell the president what he needs to hear—not what he wants to hear," Weber said in a statement.

Trumka and Trump have feuded in the past. Trumka has criticized NAFTA but has repeatedly said Trump’s replacement USMCA deal is worse and that unions are united against supporting it. Trumka recently led his own delegation to Mexico to discuss the deal.

Trump has said that Trumka is a reason unions are performing "poorly."

This story was updated at 9:17 a.m. Tuesday.