Andrew Yang on Saturday tore into Donald Trump, calling him fat and a slob who cheats at golf, challenged him to a push-up contest and said America would love to see the president pass out trying to run a mile.

The Democratic presidential contender started his presidential rift when chatting about all the fried food he was enjoying at the Iowa State Fair.

'I can't be eating crap on the trail too often because I need to stay in presidential form,' Yang told reporters after he spoke at a gun forum on Saturday.

'No one wants a president who doesn't seem he can run a mile. I think. I don't know,' he said.

Andrew Yang on Saturday tore into Donald Trump

Yang called President Donald Trump a slob who cheats at golf

He then turned to rip on the president.

'I don't think Donald Trump can run a mile. Would you guys enjoy watching Donald Trump run a mile? That would be hysterical. What does that guy weigh? 280 or something,' Yang said.

'I say he like passes out at the quarter mile mark,' he added.

Trump, at his last presidential physical in February 2019, tipped the scale at 243 pounds, according to his doctor.

At 6 feet 3 inches tall, Trump had the body mass of 30.4. Anything over 30 is considered obese.

Yang said he'd love to challenge Trump - who is known for his love of fast food and destain for exercise - on the track.

'Oh yeah. I'd challenge Donald Trump to any physical or mental feat under the sun. Oh god. What can that guy beat me at? Being a slob?,' he said.

His campaign staff tried to pull Yang from his question-and-answer session with reporters but Yang stayed before the microphones and kept on going.

'I can do approximately infinitely more push ups to Donald Trump,' he said.

When reporters asked him to demonstrate, the campaign staff stepped in and Yang declined to do so but said: 'I take pride in my ability to do push ups on a dime.'

But then Yang, a businessman whose signature line is 'the opposite of Donald Trump is an Asian who likes math,' went through a list of items he where he could beat the president.

Yang enjoyed a turkey leg at the Iowa State Fair

President Trump is known for his love of fast food and distain for exercise; he's seen here at a January White House even where he served some of his fast food favorites

'I want to go through this intellectually, like what could Donald Trump possibly be better than me at? An eating contest? Like something that involves, keeping something on the ground and having really large body mass, like if there was a hot air balloon that was rising, and you needed to try and keep it on the ground?,' he said.

'He would be better than me at that because he is so fat,' Yang added.

At that point a campaign staffer stepped in: 'Andrew.'

But Yang kept going.

He conceded, when asked by DailyMail.com, that the president may be able to beat him at golf but then said it would be hard to know because Trump cheats at the game.

'He might be able to beat me at golf although I'm told he cheats a lot so who knows what his true golf ability is,' he said.

Trump plays golf most weekends and is currently at his Trump golf club in Bedminister, N.J. for the next few weeks.

There have been allegations he cheats at the game.

An August 2017 Sports Illustrated piece noted: 'Trump will sometimes respond to a shot he duffed by simply playing a second ball and carrying on as if the first shot never happened. In the parlance of the game, Trump takes floating mulligans, usually more than one during a round. Because of them it is impossible to say what he has actually shot on any given day, according to 18 people who have teed it up with Trump over the last decade.'

Yang then faced the cameras to issue this challenge: 'Donald Trump - I challenge you to just about any physical or intellectual feat because you're a terrible president. And America would love to see you pass out trying to run a mile.'

After his 2018 physical, Trump's doctor recommended he improve his diet and noted the president said he'd like to lose 10 or 15 pounds.

The president takes a drug for his cholesterol but doesn't drink or use tobacco products.

President Trump, seen here in Scotland in July 2012, plays golf nearly every weekend

Andrew Yang choked up at a gun forum when discussing gun violence and children

Yang, seen here with his family, is a father of two

Yang was coming off an emotional back-and-forth at he crowd of about 700 at the Everytown for Gun Safety Action forum in Des Moines on Saturday.

The father of two choked up when asked about protecting children from gun violence.

Stephanie, a gun violence survivor, talked about how her four-year-old daughter died from a stray bullet in March 2011 and asked Yang how he would address unintentional shootings by children.

After her story, Yang went down the audience to hug her and then choked up, wiping away tears on stage.

'I have a six and three year old boy,' Yang said, choking up, unable to speak and wiping back tears.

'I was imaging it was one fo them that got shot and the other saw it. I am so sorry,' he said as the audience applauded in encouragement.

'The biggest downside of running for president for me is I don't get to see my family very much,' he explained.