Kamala Harris said her team is prepared to challenge Donald Trump if he tried to prematurely declare victory in the race.

In an interview with Sky News' partner network NBC News she said America is ready for a female president of colour.

Meanwhile Mr Trump called Ms Harris "lazy as hell" at an event in Miami aimed at wooing Latino voters.

At a rally later in the day in Greensboro, North Carolina, he called Ms Harris a "stupid person" and asked: "Does she drink? Is she on drugs?"

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While Ms Harris did not appear on the campaign trail on Tuesday, it was the first day in more than two weeks she had no public events scheduled and came a day after she visited three swing states.

Instead, her campaign sent out several key representatives, including Barack Obama, who was introduced on stage by Eminem in the rapper's hometown of Detroit, Michigan.

The former president joked he had "noticed my palms are sweaty" before rapping several lines from the Grammy award-winning artist's hit song Lose Yourself.

"Love me some Eminem," he added.

Eminem told the crowd Ms Harris "supports a future for this country where these freedoms and many others will be protected and upheld."

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Obama acknowledges election will be 'tight'

Earlier in the day Mr Obama told voters in Wisconsin the election was "going to be tight" in the state and "all across the country... because a lot of Americans are still struggling" after the events of recent years, including the pandemic.

"I understand why folks are looking to shake things up," the former president said.

"What I cannot understand is why anybody would think Donald Trump will shake things up in a way that's good for you."

Trump calls Obama 'a real jerk'

Mr Trump attacked Mr Obama as "a real jerk" at a rally in North Carolina, describing him as "a divider" and saying "he was terrible".

"He's trying to campaign because [Harris is] incapable of campaigning, so they sent him in to try. He's not going to do it," Mr Trump said.

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Biden says Trump is 'a danger to the republic'

President Joe Biden took aim at his Republican predecessor during an appearance in New Hampshire, saying: "He has no concept of anything. No plan."

He added: "This guy is a danger to the republic."

And Ms Harris's running mate Mr Walz poked fun at Mr Trump for his recent visit to McDonald's, quipping: "That five minutes he stood next to the deep fryer are the hardest he's worked in his life."

The Democrat also joked McDonald's clown Ronald McDonald wears less make-up than Mr Trump.