Biden claps back at Trump in fiery Pittsburgh speech: 'He's a loser'

"Donald Trump is a loser," Biden told the audience. "He's a loser of a candidate, and he's a loser of a man.

"I've never been this direct," Biden added. "But I tell you what, [Trump] is about making sure you push people down. He thinks the way you get ahead is to push people down." 

Some longtime unions have altogether declined to endorse a presidential candidate in 2024, citing the split ideology among their members.

Many also remain lukewarm about Harris' campaign, viewing her as doing little to win their vote in the months since entering the presidential race.

"The last thing we need is for Trump to get elected, to take away all the things we've done," he said. "How many of you have pensions now? How many of your families have pensions?" Biden asked.

Trump, he said, "opposes it."

"Turns out the wealthiest man in the world, now [Trump's] ally, was an illegal worker here," Biden told the audience, though he stopped short of mentioning Musk by name. 

The Biden administration did not immediately respond to a request from Fox News Digital for clarification about the president's remark. 

Musk is one of Trump's highest-profile supporters and has donated more than $118 million to a super PAC supporting his re-election.

The unsparing criticism in the speech was something new from Biden, now a lame-duck candidate in his final two months of the presidency. 

And that knowledge may have invigorated the outgoing president, whose voice got louder and stronger as his speech continued.

"There is more to do, and Kamala is going to make it happen," Biden said, imploring the crowd once again to vote in the Nov. 5 election.

"I can think of no man who has thought less of the American worker," Biden said of Trump. He is a man with "no character," and who "doesn't give a d--- about union members."