Pete Hegseth, President-elect Donald Trump's choice ... (AP Photo/Ben Curtis) Sen. Lisa Murkowski, R-Alaska, speaks with reporters outside the Senate chamber at the Capitol in Washington ...

Pete Hegseth, a former combat veteran and TV news show host, says he will be a "change agent" and a "warrior" for the department as Republicans demand new and strong leadership in the Pentagon.

President Donald Trump has begun his second administration with a series of controversial moves and decisions.