Trump hits union chiefs after Biden gets key endorsement

President TrumpDonald John TrumpJimmy Carter: 'I hope there's an age limit' on presidency White House fires DHS general counsel: report Trump to cap California trip with visit to the border MORE on Monday blasted union leaders after former Vice President Joe BidenJoe BidenJimmy Carter: 'I hope there's an age limit' on presidency 2020 candidates keep fitness on track while on the trail Mark Mellman: The most important moment in history? MORE received the endorsement of a major firefighters labor group.

“I’ll never get the support of Dues Crazy union leadership, those people who rip-off their membership with ridiculously high dues, medical and other expenses while being paid a fortune. But the members love Trump,” the president said.

Trump, who has long claimed support of rank-and-file union members, added that “they look at our record economy, tax & reg cuts, military etc.” and see a “WIN!”

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The president’s latest attack came hours after the International Association of Fire Fighters announced it would endorse Biden's 2020 Democratic presidential bid after staying out of the 2016 election, declining to endorse Democratic nominee Hillary ClintonHillary Diane Rodham ClintonGOP struggles with retirement wave Overnight Energy: Trump to revoke California's tailpipe waiver | Democrats propose bill to revoke Trump endangered species rollback | Trump officials finalize rule allowing fewer inspectors at pork plants Mark Mellman: The most important moment in history? MORE or Trump.

While it was widely expected, the endorsement gave Biden a boost as he got set to hit the campaign trail for the first time on Monday with a rally in Pittsburgh.

People close to Trump believe Biden could be the president’s most formidable general election opponent, since he could earn support from white, working-class voters in states Trump won in 2016, including Pennsylvania, Michigan and Wisconsin.