Pakistan, Aug. 18 -- British Prime Minister Andy Burnham exchanged messages with an impostor posing as US President Donald Trump's chief of staff, according to reports published Monday.

A spokesperson for Burnham declined to comment, saying it was policy not to discuss "national security matters."

Politico cited four unnamed officials in first reporting that Burnham thought he was messaging with Susie Wiles before he became suspicious and cut off communications.

Last year, the US government investigated a series of messages that elected officials, business executives and other prominent figures in the US received messages from someone posing as Wiles.

Soon after those incidents, the State Department warned US diplomats of attempts to ...