LONDON — President Trump has offered the British prime minister advice on Brexit. The president’s son said this week that she should have followed it.

Donald Trump Jr. accused “the European elites” of trying to sabotage Britain’s withdrawal from the European Union, in an op-ed in The Daily Telegraph on Wednesday. He put some of the blame on Prime Minister Theresa May, and declared that “democracy in the U.K. is all but dead.”

“Next Friday, March 29, is supposed to be the British people’s Independence Day,” Mr. Trump wrote. “But because the elites control London from Brussels, the will of the people is likely to be ignored.”

It is unclear what expertise Mr. Trump has in British and European politics and government, or whether Britons care about what he has to say. But his views appear to align with his father’s.