Trump calls on Britain to "walk away" if EU doesn't accept its demands

In the interview, the president posed the idea that Mr. Farage, the leader of the newly founded Brexit Party who has been a battering ram to traditional conservative politics in Britain and a rival and irritant to Mrs. May, should take over the negotiations.

Mr. Trump, who once suggested that Mr. Farage become ambassador to the United States, praised him as a “very smart person” who could help guide Britain after its decision to leave the European Union. Mr. Farage has backed such a departure for decades.

“I like Nigel a lot. He has a lot to offer,” Mr. Trump said. “He is a very smart person. They won’t bring him in. Think how well they would do if they did. They just haven’t figured that out yet.”