Theresa May revealed that Donald Trump told her to "sue" the European Union instead of bargaining with them.
The US President said in a press conference on Friday that he had made her a proposal to deal with Brexit, but she found it "brutal."
The Prime Minister revealed the details of his advice when she appeared on Sunday at the BBC show Andrew Marr.
"He told me to sue the EU," she said, smiling. "Do not Negotiate – Sue Them."
"Actually, no, we're in negotiations with them," she added, which is considered a dismissal of the president.
Then she said, "But interestingly enough, the President also said: Do not leave the negotiations, because then you'll be stuck."
Host Marr also overburdened the PM with Mr. Trump, grabbed her by the hand and seemed to lead her to a press conference.
"Whenever he brings me down a slope or down a staircase … he takes my hand to help me ascend," she said, denying a claim that she looked "submissive."
The PM also defended its Brexit plan, urging Tory rebels and other critics to back it up.
Ministers David Davis and Boris Johnson stepped back from publishing a Brexit White Paper last week, claiming that the deal was not what people voted in the 2016 referendum.
In an article for The Mail on Sunday, Ms. May called for MEPs to adopt a "practical and pragmatic" approach rather than facing a "harmful and disorderly" Brexit.
Ms. May admitted that some parliamentarians were concerned about her plan for a "common set of rules" with the EU on goods and customs traded in a so-called "free trade area between Britain and the EU".
She insisted, however, that she could not see any "viable alternative" to the proposals agreed by the Cabinet at Checkers, which would keep trade as "smooth as possible" and, at the same time, the return of a hard line between Northern Ireland and the Republic ,
"We have to keep an eye on the price, and if not, we risk losing Brexit," she said.
"I know that there are some who have concerns about the" common set of rules "for goods, and the customs regulations we propose will underpin the new free trade area between the EU and the UK, and I understand these concerns.
"But the legacy of Brexit can not be a hard line between Northern Ireland and Ireland that dissolves the historic Belfast Accord.
"It can not be the destruction of our precious UK with a border with the Irish Sea, and it can not be the destruction of integrated supply chains and just-in-time processes on which jobs and livelihoods depend."
Their warning came when the Commercial Law returned to the House of Commons on Tuesday with the rival amendments of the Pro and Anti-EU Conservatives.
She said that a series of "ruinous" changes, supported by members of the pro-Brexit Tory European Research Group, would jeopardize the government's plans for a no-deal scenario.
"This could lead to a harmful and disorderly Brexit, because without this passage of the law, we would not be able to reap the benefits of more than 40 existing trade regimes and we will not have the resources to supply consumers, industries and workers protect unfairly traded goods in a post-Brexit UK, "she said.
She also warned that the government could not accept a pro-EU Tories proposal that would keep Britain in a customs union with the EU after Brexit.
"This would be the ultimate betrayal of the Brexit vote, which would eliminate our ability to have an independent trade policy and abandon Britain's role on the global stage as a force for free trade and endangerment of the jobs and livelihoods of citizens will never do it. " stand for it, "she said.
In practice, the Brexitians have little chance of success as Labor does not support them, while it is unclear whether the pro-EU group, which has largely supported the Checkers plan, will push ahead with its amendment.
Ms. May's intervention came when former Brexit minister Steve Baker, who along with Boris Johnson and David Davis abandoned the Checkers plan, said the proposal was the work of an "establishment elite" that wanted to prevent the EU referendum.
"It seems to me that there was an annual value of cloak and dagger to get us into the Checkers position," he told The Sunday Telegraph.
"An establishment elite that has never accepted the fundamental right of the public to choose its institutions democratically is working to overturn them.
"We are back to what officials wanted a year ago, the advice they gave then of something like the EEA membership (European Economic Area) plus something like the Customs Union.
"In terms of who ultimately has the pen to the papers submitted to the Cabinet for collective decision, it was the Cabinet Office's European unit, and they obviously pursued a different end goal than what we were dealing with."