Elon Musk urged U.S. officials to audit how much gold is at the Fort Knox military base in Kentucky, addressing decades-old conspiracies that the U.S. gold reserves are no longer there.

Elon Musk took to a stage in Washington, D.C., on Thursday, waving a blinged-out chainsaw gifted by Argentina's President Javier Melei. Musk, wearing a black "Make America Great Again" hat at the ...