Sen. Markwayne Mullin, R-Okla., tapped by President Donald Trump to replace Homeland Security Secretary Kristi Noem, attends a St. Patrick's Day breakfast hosted by Vice President JD Vance and Second lady Usha Vance in honor of Ireland's Prime Minister Micheál Martin and his wife Mary O'Shea, at the Vice President's residence in the U.S. Naval Observatory, Tuesday, March 16, 2026 in Washington. (Roberto Schmidt/Pool via AP)

FILE - Secretary of State Marco Rubio, left, speaks next to Defense Secretary Pete Hegseth during a meeting between U.S. President Donald Trump with NATO Secretary General Mark Rutte at the NATO summit of heads of state and government in The Hague, Netherlands, June 25, 2025. (Brendan Smialowski/Pool Photo via AP, file)