Three White House employees have been removed from their posts amid allegations they had improper contact with foreign women during president Donald Trump's Asia tour.

The military personnel, who worked for a specialised unit providing the president with secure communications, are alleged to have broken a curfew during Mr Trump's trip to Vietnam earlier this month.

Dana White, the Pentagon's chief spokeswoman, confirmed that the allegations during the president's 12-day tour of Asia were "under investigation".

It will raise fears that this may be similar to a high-profile incident during Barack Obama's administration where 10 secret service agents were sacked for taking prostitutes back to their hotel rooms while the president was visiting Colombia.

The 2012 incident raised concerns that prostitutes had access to the agents' rooms and potentially sensitive information regarding Mr Obama's movements.