When President Donald Trump chose Pete Hegseth for Defense secretary, incoming officials knew they’d need to surround the inexperienced Fox News host with accomplished staff who could handle the nation’s largest bureaucracy. Hegseth would be the show horse, they figured, and others at the top would keep the Pentagon on track.

What happened was the opposite. Hegseth surrounded himself with advisers who quickly turned into vicious rivals for power — whose bitter brawl has now unraveled into revenge power plays, surprise firings, accusations of leaking and embarrassing headlines that are blowing up the Pentagon, distracting from Trump’s agenda and possibly jeopardizing Hegseth’s job.

Many administration feuds are driven by ideological or factional differences, splitting old-school conservatives from MAGA headliners and “America First” activists. That does not appear to be the case here: This one is all about personality conflict, according to interviews with nine current and former Defense Department officials as well as others close to the feud, granted anonymity to discuss a sensitive political issue. Hegseth’s closest advisers privately jockeyed for influence, creating festering distrust and gamesmanship that has rocked the world’s premier defense agency.