THERESA May has revealed Donald Trump told her to "sue the European Union" rather than negotiate with it.

The Prime Minister was asked about the "brutal" advice the US President said he had given her following the Brexit vote. 

Speaking to the BBC's Andrew Marr, she said: "He told me I should sue the EU – not go into negotiations, sue them."

During an extraordinary joint press conference on Friday, Mr Trump had said he gave the Prime Minister a suggestion on how to handle the EU. 

He said: “I think she found it maybe too brutal - and that's ok, I can see that - I gave her a suggestion, not advice. 

"I could fully understand why she thought it was a little bit tough.

“Maybe someday she will do that, if they don’t make the right deal, she might very well do what I suggested that she might want to do but it is not an easy thing."

Mrs May said the President had also insisted at the same press conference, held at her Chequers country residence, that she shouldn't walk away from the EU talks.

It comes as she warned Tory rebels seeking to wreck her blueprint to leave the EU that they could be left with “no Brexit at all” unless they fall into line.