LONDON — U.K. Prime Minister Andy Burnham engaged with messages from somebody impersonating one of Donald Trump’s closest advisers, four officials have told POLITICO.

The new PM communicated with someone posing as White House chief of staff Susie Wiles before becoming suspicious that the contact was illegitimate, the officials said.

“We do not comment on national security matters,” Downing Street said. One person briefed on the communications said a “few messages” were exchanged after the PM entered No. 10 but insisted they were “of no significance.”