The new Homeland Security secretary is Sen. Markwayne Mullin of Oklahoma, whom President Donald Trump has announced he intends to appoint to replace Kristi Noem.

Who holds the job right now?

  • Kristi Noem has been serving as Secretary of Homeland Security since early 2025 under President Trump.
  • On March 5, 2026, Trump announced that Noem is leaving the role and that Sen. Markwayne Mullin will take over as Secretary of Homeland Security.
  • Mullin is currently described as Trump’s nominee or intended replacement; he still needs to go through the standard confirmation process in the Senate before formally taking office.

So, in practical political conversation and in most “latest news” coverage, when people ask “who is the new Homeland Security Secretary,” they are referring to Markwayne Mullin , Trump’s chosen successor to Kristi Noem, announced in early March 2026.

Quick context on the change

  • Trump publicly said Kristi Noem “will leave her role” as Homeland Security Secretary and that Mullin “will become” Secretary of Homeland Security effective March 31, 2026.
  • Major outlets like CNN and NBC News are framing Mullin as Trump’s pick to replace Noem at DHS.
  • Coverage notes that this is a significant move because Noem was a high‑profile enforcer of Trump’s hardline immigration policy, and her exit raises questions about how Mullin might shape DHS going forward.

Why it’s trending

  • The Department of Homeland Security sits at the center of U.S. immigration enforcement, border security, and domestic security debates, so any leadership change is big political news.
  • Noem’s tenure brought heavy scrutiny, including aggressive immigration sweeps and controversies that contributed to political pressure for a change.
  • Mullin’s nomination is being discussed widely in political news and forums as part of the broader story of how Trump’s second-term immigration and security agenda may evolve after this shake‑up.

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