Secretary of the Navy John Phelan, who has appeared on multiple editions of ARTnews’s Top 200 Collectors list, is stepping down from his position. Undersecretary Hung Cao will become acting secretary, according to a short post on X by Sean Parnell, chief Pentagon spokesperson.

While Parnell’s statement contained little information about Phelan’s departure, the New York Times characterized it as a “firing,” saying that it followed months of disagreements with senior members of the Department of Defense over how to revamp the Navy’s shipbuilding program. Phelan is the latest cabinet secretary to leave during President Donald Trump’s second term. Earlier this week, Labor Secretary Lori Chavez-DeRemer resigned amid allegations of abuse of power, per the Associated Press.