Move comes as union representing US diplomats said it was ‘deeply concerned’ by the process, which could ‘politicise’ foreign service

The Trump administration has quietly recalled nearly 30 ambassadors and other senior overseas diplomats as the Trump administration plans to promote appointees loyal to the new administration to higher levels of the state department, according to diplomatic sources.

The recall of the ambassadors or heads of mission, which were confirmed by several current and former senior diplomats, was unusual for targeting career foreign service officers heading embassies overseas who are generally left in place after a change in administration because they strive to be apolitical.

But the Trump administration had vowed to oust a “deep state” of civil servants in a process that critics have called a purge of a professional class of government employees including senior overseas diplomats.

“This is a standard process in any administration,” a current senior state department official said in response to a request for comment from the Guardian. “An ambassador is a personal representative of the President, and it is the President’s right to ensure that he has individuals in these countries who advance the America First agenda.”