The new U.S. Secretary of Homeland Security is Markwayne Mullin, a Republican senator from Oklahoma who was confirmed in March 2026 to replace Kristi Noem.

Quick Scoop: Who is the new Secretary of Homeland Security?

In early 2026, President Donald Trump selected Markwayne Mullin to serve as the new Secretary of Homeland Security, replacing Kristi Noem after a turbulent period at the department. Mullin was subsequently confirmed by the Senate in late March 2026 and sworn in as the current Homeland Security secretary.

Fast facts about Markwayne Mullin

  • Republican senator from Oklahoma before his appointment.
  • Confirmed by the U.S. Senate in a 54–45 vote in March 2026.
  • Took over from Kristi Noem, who had faced bipartisan criticism and political headwinds over DHS controversies.
  • Has a background as a business owner and former mixed martial arts competitor.
  • Member of the Cherokee Nation, noted as a Native American senator with a prominent role in national security policy.

Why this is trending now

The question “who is the new secretary of homeland security” is trending because Mullin’s confirmation marks the first major Cabinet shake-up of Trump’s second term and comes amid intense debate over immigration enforcement and border security. DHS is under unusual scrutiny due to shutdown-related funding battles, controversial self-deportation campaigns, and high-profile border incidents, so a new leader at the helm naturally dominates political news and forum discussions.

What changes might Mullin bring?

It is widely expected that Mullin will broadly continue Trump’s hard-line immigration and border policies, given his record as a strong ally of the president in Congress. At the same time, observers are watching to see whether his style—known as combative and unapologetically conservative—will intensify enforcement approaches or lead to clashes with career officials, courts, and Congress.

Mini timeline

  1. Kristi Noem serves as Homeland Security secretary into 2025, facing criticism over rhetoric and DHS contract decisions.
  1. In early March 2026, Trump announces he will replace Noem with Sen. Markwayne Mullin.
  1. March 23, 2026: The Senate confirms Mullin as the next Secretary of Homeland Security.
  1. Late March 2026: Mullin is sworn in and becomes the current secretary, while Noem transitions to a special envoy role.

Bottom line: If you’re asking “who is the new secretary of homeland security” right now, the answer is Markwayne Mullin—newly confirmed, politically aligned with Trump, and stepping into DHS at a particularly contentious moment for U.S. immigration and security policy.

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