US President Donald Trump is set to shuffle his top generals as he needs to tackle a number of huge foreign policy challenges over the coming months, a media report said.

Behind the scenes, the White House and Pentagon are looking for a new slate of senior officers to fill several key jobs with several senior military figures set to retire, CNN said in its report on Sunday. Defence Secretary James Mattis is playing a central role in making recommendations for nominations that will have to be confirmed by the Senate.