An April 2017 file photo shows then-U.S. president Donald Trump appearing on 'Fox & Friends' with Pete Hegseth. Trump announced Tuesday that he is nominating Hegseth, a Fox News host and Army veteran, to serve as his defence secretary.

U.S. president-elect Donald Trump said Tuesday that he is nominating Pete Hegseth, a Fox News host and Army veteran, to serve as his defence secretary.