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: White House press secretary Karoline Leavitt walks into the West Wing after speaking to reporters on the North Lawn of the White House on March 18, 2026 in Washington, DC. Leavitt took questions on NATO allies, Tulsi Gabbard, and the timeline for U.S. President Donald Trump's upcoming China trip, among other topics. (Photo by Andrew Harnik/Getty Images)

Senator Markwayne Mullin (R-OK), nominee to be Secretary of Homeland Security, is sworn in 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)

A view of the boots of US Senator Markwayne Mullin (R-OK), nominee to be Secretary of Homeland Security, as he 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: White House press secretary Karoline Leavitt speaks to reporters outside the West Wing of the White House on March 18, 2026 in Washington, DC. Leavitt took questions on NATO allies, Tulsi Gabbard, and the timeline for U.S. President Donald Trump's upcoming China trip, among other topics. (Photo by Andrew Harnik/Getty Images)

WASHINGTON, DC - MARCH 18: U.S. Sen. Markwayne Mullin (R-OK) arrives to testify 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)

WASHINGTON, DC - MARCH 18: An opening statement by Chairman Sen. Rand Paul (R-KY) is seen on a screen during a confirmation hearing for U.S. Sen. Markwayne Mullin (R-OK) 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 Chip Somodevilla/Getty Images)

WASHINGTON, DC - MARCH 18: An opening statement by Chairman Sen. Rand Paul (R-KY) is seen on a screen during a confirmation hearing for U.S. Sen. Markwayne Mullin (R-OK) 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 Chip Somodevilla/Getty Images)