The U.K. leader believed he was communicating with White House chief of staff Susie Wiles.

The British Prime Minister's Office at Downing Street denied to comment on the breach, calling it a "national security matter". But it also did not deny that the messages were exchanged between Burnham and the person.

The British Prime Minister's Office at Downing Street denied to comment on the breach, calling it a "national security matter". But it also did not deny that the messages were exchanged between Burnham and the person.

British Prime Minister Andy Burnham briefly texted a person he thought was Susie Wiles. Read more at straitstimes.com. Read more at straitstimes.com.

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

British Prime Minister Andy Burnham exchanged messages with an impostor posing as U.S. President Donald Trump's chief of staff, according to reports published Monday.

British Prime Minister Andy Burnham reportedly exchanged messages with an impostor posing as Susie Wiles, chief of staff to President Donald Trump.

Andy Burnham exchanged messages with an impostor posing as Susie Wiles before becoming suspicious. The episode has revived concerns over political impersonation attempts and cybersecurity risks.

Aug. 17 (UPI) -- British Prime Minister Andy Burnham communicated with a person posing at U.S. President Donald Trump's chief of staff, Susie Wiles, sources familiar with the interaction told media outlets.