DONALD Trump has torn up the usual political protocol and intervened in the UK election, warning that Jeremy Corbyn would be "so bad" for Britain while hailing Boris Johnson as "the exact right guy for the times".

The US President, interviewed by Nigel Farage on LBC radio, also claimed if the Brexit Party teamed up with the Prime Minister they would be an "unstoppable force".

In response, Mr Corbyn tweeted: "Donald Trump is trying to interfere in Britain's election to get his friend Boris Johnson elected.

"It was Trump who said in June the NHS is 'on the table'. And he knows if Labour wins US corporations won't get their hands on it. Our NHS is not for sale."

Earlier, the President said: "Corbyn would be so bad for your country…He'd take you on such a bad way; he'd take you into such bad places. Your country has tremendous potential. It's a great country."

He denied the US would want to get involved in the NHS, noting: “No, we're just talking about trade."

Mr Trump’s unexpected intervention came as the Labour leader launched his party’s election campaign in London with a “people versus privilege” message and a pledge that a Labour Government would sort out the Brexit issue in six months.

Meanwhile, Mr Johnson underlining his “people’s priorities” agenda took to the campaign trail with visits to a hospital, a school and a police station, stressing how he would ensure Britain left the EU by January at the “absolute latest”.