Sean O'Brien (R), General President of the International Brotherhood of Teamsters, looks on as US Senator Markwayne Mullin (R-OK), nominee to be Secretary of Homeland Security, testifies during a Senate Committee on Homeland Security and Governmental Affairs confirmation hearing on Capitol Hill in Washington, DC, on March 18, 2026. (Photo by Oliver Contreras / AFP via Getty Images)

US Senator Markwayne Mullin (R-OK), nominee to be Secretary of Homeland Security, testifies during a Senate Committee on Homeland Security and Governmental Affairs confirmation hearing on Capitol Hill in Washington, DC, on March 18, 2026. (Photo by Oliver Contreras / AFP via Getty Images)

US Senator Markwayne Mullin (R-OK), nominee to be Secretary of Homeland Security, testifies during a Senate Committee on Homeland Security and Governmental Affairs confirmation hearing on Capitol Hill in Washington, DC, on March 18, 2026. (Photo by Oliver Contreras / AFP via Getty Images)

US Senator Markwayne Mullin (R-OK), nominee to be Secretary of Homeland Security, testifies during a Senate Committee on Homeland Security and Governmental Affairs confirmation hearing on Capitol Hill in Washington, DC, on March 18, 2026. (Photo by Oliver Contreras / AFP via Getty Images)

Displayed on a screen, committee chairman US Senator Rand Paul, Republican from Kentucky, speaks as Senator Markwayne Mullin (R-OK), nominee to be Secretary of Homeland Security, testifies during a Senate Committee on Homeland Security and Governmental Affairs confirmation hearing on Capitol Hill in Washington, DC, on March 18, 2026. (Photo by Oliver Contreras / AFP via Getty Images)

US Senator Markwayne Mullin (R-OK), nominee to be Secretary of Homeland Security, testifies during a Senate Committee on Homeland Security and Governmental Affairs confirmation hearing on Capitol Hill in Washington, DC, on March 18, 2026. (Photo by Oliver Contreras / AFP via Getty Images)

US Senator Markwayne Mullin (R-OK), nominee to be Secretary of Homeland Security, testifies during a Senate Committee on Homeland Security and Governmental Affairs confirmation hearing on Capitol Hill in Washington, DC, on March 18, 2026. (Photo by Oliver Contreras / AFP via Getty Images)

WASHINGTON, DC - MARCH 18: U.S. Sen. Markwayne Mullin (R-OK) testifies during a confirmation hearing to be the next Secretary of the Department of Homeland Security in the Dirksen Senate Office Building on March 18, 2026 in Washington, DC. President Trump nominated Mullin to replace Kristi Noem as DHS Secretary. (Photo by Anna Moneymaker/Getty Images)