US Navy Secretary John Phelan is leaving the Trump administration, the Pentagon announced on Wednesday. His departure will be "effective immediately," Pentagon spokesman Sean Parnell said in a social media post. Navy Undersecretary Hung Cao will serve as acting secretary.
Phelan is the latest high-ranking military leader to leave the administration in recent months. His departure comes amid the US-Israel war with Iran and the continued US blockade of the Strait of Hormuz. The Navy did not provide a reason for Phelan's departure.
What the Right Is Saying
Trump administration supporters have defended the leadership changes as necessary for implementing the president's agenda. Phelan's replacement, Cao, is a 25-year Navy veteran who ran an unsuccessful campaign for the US Senate in Virginia in 2024, endorsed by Trump, against incumbent Democratic Senator Tim Kaine.
White House Press Secretary Karoline Leavitt said the president is "satisfied" with the ongoing US naval blockade on Iranian ports. The administration has pointed to the need for leaders who align with Trump's vision for expanding the country's merchant and civilian fleet, including the "Golden Fleet" initiative announced at Mar-a-Lago last December.
What the Left Is Saying
Progressive critics have raised concerns about the pattern of senior military departures under Defense Secretary Pete Hegseth. Since entering the Pentagon, Hegseth has fired more than a dozen senior military officers, including the chief of naval operations and the Air Force's vice chief of staff. Critics have characterized these removals as destabilizing to military readiness and command structure.
Democratic lawmakers and defense policy experts have questioned whether the administration is prioritizing loyalty over experience in military leadership appointments. The departures of Army Chief of Staff Randy George, along with Gen David Hodne and Maj Gen William Green, have drawn scrutiny from lawmakers concerned about continuity in military operations.
What the Numbers Show
Phelan was sworn in as Secretary of the Navy in March 2025 after being nominated by President Donald Trump in 2024. He was a major donor to Trump's campaign and had not previously served in the military, making him a civilian leader overseeing the Department of the Navy.
Cao became undersecretary in October 2025. During his 2024 Senate campaign, he criticized the military's diversity, equity and inclusion initiatives, saying the Navy needs "alpha males and alpha females who are going to rip out their own guts, eat them and ask for seconds" to win wars.
The Strait of Hormuz remains a vital global shipping route, supplying much of the world's oil. Iran announced it had "seized" two ships in the strait amid continued clashes, even as a ceasefire in the US-Israel war continues.
Andrew Peek, a former State Department deputy assistant secretary, told the BBC he estimated about 30% of Phel's departure was related to lack of movement on fleet expansion, with the remaining 70% likely attributable to replacement with someone closer to the MAGA base.
The Bottom Line
The departure of John Phelan marks another in a series of high-ranking military leadership changes under the Trump administration. As the US maintains its blockade of Iranian ports amid ongoing Middle East tensions, the Pentagon will be led by acting Navy Secretary Hung Cao, a career naval officer.
The administration has not specified a timeline for nominating a permanent replacement. The ongoing leadership transitions, coming during a period of heightened Middle East tensions and naval operations in the Strait of Hormuz, will be watched closely by congressional oversight committees and defense policy analysts.