Kristi Noem is being replaced as Secretary of Homeland Security by Oklahoma Senator Markwayne Mullin, who has been tapped by President Donald Trump to take over the job.

What’s Happening Right Now

Kristi Noem is stepping down as Secretary of Homeland Security after facing heavy criticism and internal frustration over her performance and recent hearings in Congress. President Trump has announced that Senator Markwayne Mullin (R‑Okla.) will be nominated as the next Secretary of Homeland Security, marking the first major Cabinet shake-up of his second term.

Who Will Replace Kristi Noem?

  • Trump has said he will replace Noem with Sen. Markwayne Mullin of Oklahoma as DHS Secretary.
  • Mullin is expected to take over the department once he is confirmed by the Senate, with an effective date around March 31, 2026 mentioned in multiple reports.
  • This move comes after days of speculation and earlier reporting that Trump aides were floating potential successors amid growing frustration with Noem’s job performance.

What Happens to Kristi Noem?

  • Noem is reportedly leaving the DHS post but is not exiting the administration entirely.
  • Trump has said she will transition to a new role as a special envoy for a Western Hemisphere security initiative called “The Shield of the Americas.”

Why This Is a Big Deal

  • The change signals that the White House is trying to reset its immigration and security messaging after Noem’s rocky tenure and controversial testimony over a large advertising contract.
  • Commentators note this is both a political and policy moment: swapping a beleaguered Cabinet secretary for a loyal Republican senator with strong backing in the Senate, where his confirmation is expected to be smooth.

Forum-Style Take

“who will replace kristi noem” is basically answered now: it’s Markwayne Mullin, barring any shock in the Senate confirmation.

The more interesting debate on forums and social media is whether this actually changes anything at the border or is just a high-profile personnel swap.

TL;DR: If you’re asking “who will replace Kristi Noem,” the answer is Sen. Markwayne Mullin of Oklahoma, nominated by Trump to become the new Homeland Security Secretary, with Noem shifting to a special envoy role.

Information gathered from public forums or data available on the internet and portrayed here.