War Department Secretary Pete Hegseth warned that "under-investment in military spending" is "the single greatest threat to America's national security."

In a New York Post opinion column published Tuesday, Hegseth made the case for President Donald Trump's proposed $1.5 trillion fiscal 2027 defense budget, arguing that maintaining overwhelming U.S. military superiority is essential to protecting national security and economic prosperity.

"If America loses its unquestioned military edge, no amount of fiscal austerity can maintain this nation's economic health," Hegseth wrote. "The future of America's economic and fiscal health depends on it."

Hegseth described urgency, efficiency, competition, and lethality as the guiding principles of the War Department, which is pursuing a sweeping modernization effort focused on emerging technologies such as artificial intelligence, cyberwarfare, autonomous systems, space capabilities, and long-range strike weapons.

The war chief's remarks come as Congress weighs the administration's defense spending proposal and considers legislation that would formally restore the Pentagon's historic Department of War name.

Earlier this month, the House Armed Services Committee approved a provision backed by Rep. Ronny Jackson, R-Texas, that would officially replace references to the Department of Defense with the Department of War throughout federal law.

The measure is part of the fiscal 2027 National Defense Authorization Act and reflects Trump's "peace through strength" philosophy.

Hegseth has embraced the change, thanking Jackson and declaring on social media that "The Department of War will officially be restored soon."

Supporters argue the name better reflects America's willingness to deter adversaries through military strength.

Critics, meanwhile, have dismissed the move as largely symbolic and potentially costly, with estimates ranging from $10 million to more than $100 million to implement.

At the same time, the administration is seeking additional military funding following the recent conflict with Iran.

Pentagon officials have informed lawmakers they may require roughly $80 billion in supplemental funding, largely to replenish munitions, repair equipment, and support operations connected to the war.

Hegseth has argued that such investments are necessary as China rapidly expands its military and global threats continue to grow.

While some lawmakers have expressed concerns about rising federal deficits, Hegseth said the Pentagon is also pursuing reforms to eliminate waste, streamline procurement, and complete a comprehensive financial audit by 2028.

"Prosperity through strength" remains the administration's guiding principle, Hegseth wrote, contending that a dominant military is the foundation of U.S. economic power and global stability.