Vice President Joe Biden lashed out at Donald Trump on Thursday in a pre-Labor Day speech that cast the Republican presidential nominee as the enemy of working men and women, and said his foot is in his mouth so often that he's choking on his silver spoon.

While Trump was in southern Ohio delivering an uncharacteristically short stump speech that lasted just 22 minutes, the gaffe-prone Biden played kettle-and-pot with foot-in-mouth Trump in the rust belt town of Warren in the state's northeast.

Complaining about Trump's contention in a November 2015 Republican primary debate that America's 'wages are too high,' Biden said the billionaire was too rich to know what he was talking about.

'This is a guy born with a silver spoon in his mouth that he's now choking on,' he said, 'because his foot's in his mouth along with the spoon!'

The vice president is himself known as a one-man gaffe factory, generating more headlines for his missteps than for his contributions to the Obama administration

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CLASS WARFARE: Joe Biden cast Donald Trump as a heartless business tycoon in a campaign rally for Hillary Clinton in the run-up to Labor Day, saying the Republican presidential nominee would work as presidnet ot undermine labor unions

On Thursday Biden was all business, however.

'American workers are three times as productive, by any study, as Asian workers are,' he claimed.

'I'm so sick and tired – I know I'm not supposed to get angry – but I'm so sick and tired of hearing people like Trump and the Chamber of Commerce, the national Chamber, talking about "We get paid too much," that we don't want to – give me a break! Give me a break.'

Trump's debate line 10 months ago concerned America's lack of competitiveness in global manufacturing markets.

'We have to become competitive with the world,' he said then. 'Our taxes are too high, our wages are too high, everything is too high.'

That, his aides hinted later, indicated that he thought Americans shouldn't take home less money from their paychecks – only that government should get a smaller cut.

Biden's history of embarrassing misstatements is legendary in U.S. political circles, making his criticism of Trump a feast of irony.

At 2014's U.S.-Africa Leaders Summit, he declared his support for the 'nation' of Africa – a continent.

​'There's no reason the nation of Africa cannot and should not join the ranks of the world's most prosperous nations in the near term, in the decades ahead. There is simply no reason,' he told heads of state and other dignitaries.

The skinny-dipping, party guest-groping bumbler who's one heartbeat away from the presidency once chaired the U.S. Senate Committee on Foreign Relations.

It was just six years ago that he noted in a diplomatic face-palm moment how Irish Prime Minister Brian Cowen's mother had 'lived in Long Island for ten years or so' before her death.

'God rest her soul,' Biden said somberly, before realizing that 'wait – your mom’s still ... your mom’s still alive. Your dad passed. God bless her soul.'

JOBS, JOBS, JOBS: Trump told a rally crowd that he would bring manufacturing employment back to Ohio, blaming the Obama administration for fostering trade policies that produce plant closures and job outsourcing

In 2012 Biden made the sign of the cross while on stage to address a group of more than 1,600 conservative rabbis in Atlanta.

Reporters guffawed later that year when he tried to capture the spirit of President Theodore Roosevelt's famous 'Speak softly' philosophy, by noting that 'the president has a big stick. I promise you.'

It brought back memories of a 2008 photo-op outside Biden's home where he told journalists that he had just returned from 'a successful dump,' which turned out to be a trip to a nearby landfill.

Two months later during an Ohio campaign speech, Biden criticized then-GOP presidential candidate Sen. John McCain for what he called a 'last-minute economic plan' that did 'nothing to tackle the number-one job facing the middle class.'

'It happens to be, as Barack says, a three-letter word: jobs. J-O-B-S, jobs.'

Several of Biden's most cringe-worthy moments have riled conservatives who say their own political stars would have been pilloried in print and on television if they had made similar comments.

'You cannot go to a 7-11 or a Dunkin' Donuts unless you have a slight Indian accent,' he told an Indian-American man in 2006, with a C-SPAN camera rolling.

'I'm not joking.'

Biden's message on Thursday was free of goofs, delivered alongside Democratic U.S. Senate candidate Ted Strickland. He focused on union bargaining rights and the threat to American industry represented by unions' declining power.

'My message to all you kids,' he told his audience, is: 'Don't make any excuse for where you're from or who you are. Don't make any excuse for our insistence that we get paid a fair wage.'

And he insisted that a President Trump would be on the side of management in any labor dispute.

'Tell your friends out there who are angry, and they say, "A pox on both their houses, I don't want to vote for anybody," ask them a question,' he said.

'I mean it sincerely. Try it, no matter what their politics are: "Do you think there's any possibility that Donald Trump would do anything other than continue to break the labor movement?"'

'All kidding aside,' he added, 'Do you actually think Donald Trump cares about raising the average salary of average workers?'

Political rhetoric based on fomenting class warfare has become a mainstay of Democratic politics, with the party's candidates framing themselves as the champions of the middle class and foils for the rich.

Trump has sought to disrupt that norm by appealing to lower middle-class white voters on the basis of a promise to return millions of lost jobs to cities that are former manufacturing powerhouses.

'We are going to win Ohio, no doubt about it,' Trump said in the town of Wilmington on Thursday, just before Biden took the stage in Warren.

'We're going to bring back your jobs,' he pledged, claiming that 'no state has been hurt worse by Hillary Clinton on trade policies than Ohio.'

Democrats this year have doubled down on their efforts to declare the GOP the party of the wealthy, casting Trump as an unsympathetic tycoon who is play-acting at populism.

Biden cited 'studies' on Thursday that concluded 'the greatest threat to growth in America and the world is the concentration of wealth in just a few hands.'

'That's what this guy's all about!' he boomed.

'By the way, Republicans didn't used to be that way. Those of you in the automobile business remember that old phrase, "This ain't your father's Oldsmobile." This ain't your father's Republican party.'

Biden closed by marveling at the prospect of giving a 'dangerous' Trump access to America's military arsenal.

'I dont believe the guy's a bad guy,' he said. 'I just think he is thoroughly, totally, completely uninformed. He has no idea what the hell he's talking about!'

'And guess what? That's okay sometimes ... but I've got a military aide with me, carrying a briefcase. No, I mean it sincerely. That briefcase has the nuclear codes in it. And God forbid, if something happened to the president, and a decision had to be made, I open it up and the nuclear codes are there.'