Just 11 months before President Donald Trump won the 2024 election, then-Sen. Marco Rubio (R-FL) championed a law based on fears about the 45th and 47th commander in chief: that in a second, nonconsecutive term, Trump would unilaterally pull the United States out of the 76-year-old NATO alliance.

The measure, cosponsored by Sen. Tim Kaine (D-VA), requires “advice and consent of the Senate or an Act of Congress before suspending, terminating, or withdrawing U.S. membership in NATO,” and was included as a provision of the 2024 National Defense Authorization Act, signed into law in December 2023.