U.S. President Donald Trump is expected to announce that Deputy Secretary of Defense Patrick Shanahan will take over from Jim Mattis as acting secretary of defense as of Jan., a senior U.S. administration official told Reuters.
Mattis resigned on Thursday over policy differences with Trump but said he would remain on the job until the end of February to ensure a smooth transition.
I am pleased to announce that our very talented Deputy Secretary of Defense, Patrick Shanahan, will assume the title of Acting Secretary of Defense starting January 1, 2019. Patrick has a long list of accomplishments while serving as Deputy, & previously Boeing. He will be great!
— Donald J. Trump (@realDonaldTrump) December 23, 2018