Pete Hegseth's tenure as defense secretary has resulted in numerous changes at the Pentagon, particularly for journalists covering the Department of Defense. CBS News national security correspondent David Martin explains.

Defense Secretary Pete Hegseth told Congress Tuesday that the Pentagon’s collaboration with Elon Musk’s Department of Government Efficiency found $6 billion in cuts so far from the agency’s budget of nearly $1 trillion.

After persistent questioning from members of Congress, Defense Secretary Pete Hegseth turned to his acting comptroller, Bryn Woollacott MacDonnell, who provided the amount it would cost to send the National Guard and Marines to immigration protests in Los Angeles.

Secretary of Defense Pete Hegseth heads to Capitol Hill for a series of Congressional hearings over the next week that are likely to be a major test of his leadership following what is widely viewed as a rocky first few months on the job.

President Trump’s deployment of the National Guard and Marines to Los Angeles to stop rioting could last 60 days and is estimated to cost at least $134 million, the Pentagon revealed Tuesday — as House Democrats slammed Defense Secretary Pete Hegseth over his role in the mission.

The defense secretary annoyed Donald Trump with a favor for Elon Musk. Hegseth’s problems only grew from there.

At least three people have turned down potential roles working for the defense secretary and former Fox News host. Supporters say his leadership has been effective.

Defense Secretary Pete Hegseth is expected to field sharp questions from members of Congress about his tumultuous start as Pentagon chief, including his sharing of sensitive military details over a Signal chat, in three separate Capitol Hill hearings beginning Tuesday.

Pete Hegseth is having trouble hiring new staff at the Pentagon. Some people don’t want to work with him after past firings and drama. Even the White House and Hegseth can't agree on who should be hired.