Sen. Mitch McConnell (R-KY) slammed President Donald Trump's move to "rebrand" the Department of Defense to the Department of War, taking a shot at Trump's "peace through strength" slogan.

"If we call it the Dept. of War, we'd better equip the military to actually prevent and win wars. Can't preserve American primacy if we're unwilling to spend substantially more on our military than Carter or Biden. 'Peace through strength' requires investment, not just rebranding," McConnell posted on X.

The 83-year-old senator and longest-serving Senate party leader has criticized Trump and the growing MAGA wing of the Republican Party.

He warned earlier this week that America was slipping into a time reminiscent of the 1930s, with a similar slogan, "America First," that poised the United States to enter an isolationist period. He has previously warned that it could put the U.S. in a "dangerous" global situation.

The phrase "America First" originated in the 1850s nativist American Party. It was used by President Woodrow Wilson during World War I. And in the 1920s, the Ku Klux Klan adopted the slogan.

The president intends to sign an executive order changing the agency's name to the Department of War, which it had been called from 1789 until its 1947 reorganization.

Other critics have called the president's rebrand "a sign of weakness."

"The name 'Department of War' conveys a stronger message of readiness and resolve compared to 'Department of Defense,' which emphasizes only defensive capabilities," the executive order says.

“It’s a much more appropriate name, especially in light of where the world is right now,” Trump said. He called the previous name "woke," according to The Associated Press, adding that it "just sounded better."