LOLITA C. BALDOR and TARA COPP.

Defense Secretary Pete Hegseth is expected to field sharp questions from members of Congress about his tumultuous start as Pentagon chief in a series of hearings beginning Tuesday. He’s likely to be asked about his sharing of sensitive military details over a Signal chat. Lawmakers have made it clear they are unhappy that Hegseth has not provided details on the administration’s first proposed defense budget, which President Donald Trump has said would total $1 trillion. It will be members’ first chance to ask about a myriad of other controversial spending by the Pentagon and the deployment of troops to quell protests in Los Angeles.