THERESA May has finally revealed the explosive Brexit advice Donald Trump gave to her – to sue the EU.

The Prime Minister said the US President told her not to even enter into a negotiation with Brussels at all, and just to start a legal war instead.

4 Theresa May said Donald Trump told her to sue the EU over Brexit Credit: BBC

She made the startling revelation while speaking to the BBC this morning, but said she did not take Mr Trump’s "brutal" suggestion on board.

Appearing on The Andrew Marr Show, the PM said: "He told me I should sue the EU."

Pressed further on what the American leader meant, she added: "Sue the EU, not go into a negotiation but sue them."

At a joint press conference on Friday, neither Mrs May or Mr Trump had divulged the contents of their conversation on how to deal with the UK's exit from the trading bloc.

4 Mr Trump said the PM found his suggestion 'too brutal' Credit: AFP

But the President did say: "As far as the advice, I did give her a suggestion. I wouldn’t say advice.

"And I think she found it maybe too brutal, and that’s — because I could see that."

Looking across at her as they spoke in the grounds of her Chequers country estate, he added: "But I don’t know if you remember what I said. But I did give her a certain amount of — I gave her a suggestion, not advice.

"I wouldn’t want to give her advice. I’d give her a suggestion. I could fully understand why she thought it was a little bit tough.

4 Mrs May finally revealed the advice Mr Trump had given her in an interview with the BBC Credit: PA

"And maybe, someday, she’ll do that.

"If they don’t make the right deal, she might very well do what I suggested that she might want to do."

He first revealed that he had given the PM some advice in The Sun’s world exclusive interview as he arrived in the UK for his first visit as President.

In it he warned her the softer Brexit blueprint outlined in the Government’s white paper would "kill" any future trade deal with the United States.

And he revealed Mrs May ignored his advice on how to toughen up the troubled talks, believing that instead she has gone "the opposite way”.

4 The American leader is currently in Scotland at his Turnberry resort on the final leg of his UK visit Credit: PA

Questioned on comments by Boris Johnson that Mr Trump "would go in bloody hard" if he was negotiating Brexit, the President swiftly replied: "He is right."

Adding: "I would have done it much differently. I actually told Theresa May how to do it but she didn't agree, she didn't listen to me. "She wanted to go a different route.

"I would actually say that she probably went the opposite way. And that is fine.

"She should negotiate the best way she knows how. But it is too bad what is going on."

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Since then there has been fevered speculation as to what exactly the advice was, with both sides staying tight-lipped.

The President’s former adviser Steve Bannon claimed yesterday Mr Trump told the PM to demand more than she ever expected to get and to maintain “momentum” to stop deals from “dragging”.

He also said he offered Mrs May some of the suggestions contained in his book The Art of the Deal, which suggests: “Overshoot your target, be tough and get on with it.”