Mar 18, 2026; Washington, DC, USA; Sen. Markwayne Mullin (R-OK) (L) greets Teamsters president Sean M. O'Brien before testifying at a confirmation hearing to be the next Secretary of the Department of Homeland Security before the Senate Homeland Security and Governmental Affairs Committee in Washington DC, on March 18, 2026.; Mandatory Credit: Jack Gruber-USA TODAY via Imagn Images