EU foreign affairs chief Federica Mogherini warned Donald Trump's administration Friday, February 10 not to "interfere" in European politics, in an apparent reference to the US president's praise of Brexit, AFP reports.

"We do not interfere in US politics... And Europeans expect that America does not interfere in European politics," said Mogherini, who is wrapping up her first visit to Washington since Trump took office.

Mogherini held her first meetings with Trump's administration on Thursday at a moment of uncertainty for trans-Atlantic ties.

While the new US leader has toned down some of his criticism of America's NATO allies since his election, he has shown no enthusiasm for the 28-member European Union and has praised Britain's decision to leave the bloc.

"The unity of the European Union, I believe, is more evident today than it was some months ago," Mogherini said Friday.

"The UK will stay a member state of the European Union for another two years at least... And it will not be able to negotiate any trade agreement bilaterally with any third country."

According to some media reports, Trump has tipped as the next US ambassador to the EU businessman Ted Malloch, who has ruffled feathers with anti-EU comments.