On May 20, 2026, Mace introduced a joint resolution to amend the Constitution to bar naturalized citizens from serving in Congress, on the federal bench, or in Senate-confirmed positions:

"Ilhan Omar. Shri Thanedar. Pramila Jayapal. All born in foreign countries, none were citizens by birth. All sitting in the United States Congress. All making clear every single day their loyalty is not to America. … If you hold power in the American government, you should be a natural-born American citizen. The people writing America's laws, confirming America's judges, and representing America on the world stage should have one loyalty: America. Not Somalia. Not any other country."

Critics noted the amendment would also bar several Republican members of Congress and any naturalized Cabinet nominee. Omar dismissed it.

Source: mace.house.gov / The Hill · archived