The unusual decision by the transition team could also mean that some of the top US embassies around the world will be left without an ambassador for months, as Trump replaces them with new appointments.
The Trump transition team has informed the US State Department that it was not making any exceptions for any of the US ambassadors who are political appointees of outgoing President Obama, the Politico reported.
A highly-placed source in the team confirmed the decision but did not specify as to how many envoys might be affected by the decision.
During his two terms, Obama named hundreds of people to the posts, roughly 30 per cent of whom are political appointees, which generally require Senate confirmation.
Following precedent set by both parties, Obama also handed out many of the ambassadorships to his campaign donors and other supporters.
Politically appointed ambassadors have at times been allowed to stay on the job for weeks or even months after the new president has taken office, to show personal courtesy for their family situations, and allow for some continuity as new administration finds its footing.
Following tradition, President Obama has directed all political appointees in his administration to submit their resignations effective on Inauguration Day, it said.
"They are mostly resigned to it now," he added.
Trump has already named Iowa Gov. Terry Branstad as his ambassador to China and bankruptcy lawyer David Friedman for the post in Israel, though it's highly unlikely that the Republican president-elect will have thought through all of his foreign envoys by now.
In the absence of the new appointments, the affected US embassies will likely be run by the highest-ranking career employee until Trump nominates someone new and that person is confirmed by the Senate.
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