Donald Trump has warned Kamala Harris's campaign donors that they will not escape his retribution if they play a role in a 2024 election 'steal'.

The GOP candidate promised he would not allow a repeat of the 'rampant Cheating and Skullduggery' he claims cost him the White House in 2020, and threatened unprecedented legal action against those who try.

Posting on X and his own Truth Social channel under the heading 'cease and desist' he said 'lawyers, political operatives, donors, illegal voters, and corrupt election officials' would all find themselves targeted.

The swipe at donors came as Trump's Democrat rival reported raising a whopping $230 million more than Trump in campaign contributions during the month of August.

'Those involved in unscrupulous behavior will be sought out, caught, and prosecuted at levels, unfortunately, never seen before in our Country,' Trump wrote.

Donald Trump demanded a change to the 25th amendment to allow for the impeachments of vice-presidents as he campaigned in Wisconsin on Saturday

Donald Trump demanded a change to the 25th amendment to allow for the impeachments of vice-presidents as he campaigned in Wisconsin on Saturday 

Kamala Harris was meeting voters during a campaign stop in Pittsburgh on Saturday

Kamala Harris was meeting voters during a campaign stop in Pittsburgh on Saturday

Three days before he faces Harris for their first presidential debate Trump repeated his charge that she covered-up Joe Biden's cognitive decline and promised a constitutional amendment to prevent it happening again.

Speaking at a campaign rally in Mosinee, Wisconsin, he said he supports 'modifying' the 25th Amendment to target any US vice president who 'lies or engages in a conspiracy to cover up the incapacity of the president of the United States'.

'If you do that with a coverup of the president of the United States, it's grounds for impeachment immediately and removal from office, because that's what they did,' he told his supporters.

Harris has denied misleading voters about the President's condition and insisted last month she was right to claim the 81-year-old was fit to serve out a second term.

'He has the intelligence, the commitment and the judgment and disposition that I think the American people rightly deserve in their president,' she told CNN's Dana Bash in her only sit-down interview since securing the Democrats' nomination.

The 25th amendment deals mainly with the circumstances in which a sitting president can be removed from office between elections and has little to say on the removal of a vice-president.

But constitutional amendments require the support from the legislatures of 38 of the country's 50 states, while the Republicans control just 28.

A VP can remove his or her boss with the support of half the cabinet and Harris resisted pressure from leading Republicans to wield the knife in the aftermath of Biden's disastrous debate performance against Trump at the end of June.

Wrangling continues over the precise rules for Tuesday's crucial 90-minute debate on ABC which will be hosted by World News Tonight anchor David Muir and ABC News Live prime anchor Linsey Davis.

Biden's team insisted that the candidate's microphones were muted when they are not talking during his debate with Trump.

Harris's team unsuccessfully demanded the reversal of that rule ahead of her first debate, reportedly hoping to use one of Trump's characteristic outbursts to her advantage during the face off.

The pair will have two minutes each for their answers, two minutes for rebuttals and one minute for follow-ups.

There will be no studio audience, and each candidate will be allowed two minutes for a closing statement.

Trump repeated his claim that Harris covered-up Joe Biden's cognitive decline

And he warned his rival's campaign donors that they will not escape his retribution if they play a role in a 2024 election 'steal' 

Around 7,000 Trump supporters turned out for his Mosinee rally in the hotly contested state of Wisconsin on Saturday

Around 7,000 Trump supporters turned out for his Mosinee rally in the hotly contested state of Wisconsin on Saturday 

Earlier on Saturday Trump insisted that his 5ft 4inch opponent will not be allowed to stand on a box behind her lectern at the Philadelphia event in a bid to match his own 6ft 3ins frame.

'No boxes or artificial lifts will be allowed to stand on during my upcoming debate with Comrade Kamala Harris,' he wrote on Truth Social.

'We had this out previously with former NYC Mayor Michael Bloomberg when he was in a debate, and he was not allowed a 'lift'.

'It would be a form of cheating, and the Democrats cheat enough. 'You are who you are', it was determined!'

But the Republican candidate was still reflecting on his former rival as he spoke at the event in Wisconsin on Saturday, telling his audience it was a 'miracle' that Biden secured the Democrats' nomination in 2020.

'We're run by stupid people. Stupid, stupid people,' he said.'And we found that out at the debate with Joe. How did that work out?

'You know, think of it. If he didn't go to that debate, he'd still be running.

'We're going to find it out again on Tuesday night. Is anybody going to be watching?

'If I destroy her in the debate, they'll say Trump suffered a humiliating debate tonight.' 

The comments below have not been moderated.

The views expressed in the contents above are those of our users and do not necessarily reflect the views of MailOnline.

By posting your comment you agree to our house rules.