Why It Matters
The Senate confirmation of Markwayne Mullin as Secretary of Homeland Security marks a significant moment in federal immigration policy, as the Department of Homeland Security remains mired in a five-week government shutdown. The appointment places a new leader at the helm of the agency responsible for executing President Donald Trump’s mass deportation agenda at one of the most operationally turbulent periods in the department’s history.
With ICE agents now deployed to airports and TSA workers going without pay, the national implications of Mullin’s leadership extend well beyond border enforcement, touching transportation security, civil liberties debates, and the broader functioning of federal agencies.
What Happened
The U.S. Senate voted Monday evening, March 23, 2026, to confirm Senator Markwayne Mullin, a Republican from Oklahoma, as the next Secretary of Homeland Security. The confirmation vote concluded at 54-45, with Mullin set to replace outgoing Secretary Kristi Noem, who was reassigned to another role within the Trump administration.
Mullin, an enrolled member of the Cherokee Nation, will become the first Indigenous person to lead the Department of Homeland Security. Shortly after the Senate adjourned, Mullin submitted his formal resignation letter from the Senate, vacating his Oklahoma seat to take on the cabinet role.
Only two Democratic senators crossed party lines to support the confirmation: Sen. John Fetterman of Pennsylvania and Sen. Martin Heinrich of New Mexico. In a notable procedural moment, Mullin cast a vote for his own confirmation before formally departing the chamber.
From Kentucky, Senator Mitch McConnell voted in favor of Mullin’s confirmation, while Senator Rand Paul voted against it, according to Senate roll call records.
By the Numbers
54–45: The final Senate confirmation vote in favor of Mullin, reflecting near party-line division.
5 weeks: The length of the ongoing DHS government shutdown, which began in mid-February 2026 after Democratic senators moved to block funding in response to the deaths of two U.S. citizens at the hands of federal immigration agents.
$175 billion: The separate funding stream passed by the Republican-led Congress specifically for immigration enforcement, keeping ICE and Customs and Border Protection fully operational despite the broader DHS shutdown.
2 deaths: Renee Good, killed by an ICE agent on January 7, and Alex Pretti, an intensive care nurse at a Veterans Administration medical center killed by CBP officers on January 24, both in Minneapolis — the incidents that triggered Democratic opposition and the subsequent shutdown.
0: The number of committee assignments Mullin held that directly covered Homeland Security policy during his Senate tenure, a gap critics have pointed to as a concern heading into the role.
Zoom Out
Mullin’s confirmation arrives as immigration enforcement has become one of the most contentious domestic policy battlegrounds in the country. The Trump administration’s push for mass deportations has generated legal challenges in multiple federal courts, protests in dozens of cities, and now a full government shutdown of the agency tasked with carrying out those policies.
The deaths of Renee Good and Alex Pretti in Minneapolis have drawn national attention to the use of lethal force by federal immigration agents, reigniting longstanding debates over ICE and CBP oversight and accountability. Several states, including Minnesota and California, have enacted or are considering legislation to limit cooperation between local law enforcement and federal immigration authorities.
Senate Majority Leader John Thune, Republican of South Dakota, acknowledged on the Senate floor that Mullin is entering DHS under extraordinary circumstances, noting the difficulty of the shutdown period. President Trump, speaking to reporters earlier Monday, expressed confidence in the pick, saying Mullin is “gonna be fantastic” in the role.
Mullin’s historic status as the first Indigenous DHS secretary has been noted by Native American advocacy organizations, though many have also raised concerns about his alignment with aggressive immigration enforcement policies that affect Indigenous communities living near U.S. borders.
What’s Next
Mullin is expected to be sworn in and begin his duties at DHS immediately following the formalization of his Senate resignation. His first priority will likely involve navigating the ongoing government shutdown, which has left TSA workers operating without pay and strained agency operations across multiple departments.
Congressional negotiations over restoring full DHS funding are expected to resume, though the timeline remains uncertain given the partisan divide that triggered the shutdown. Mullin will also face immediate decisions regarding the deployment of ICE agents to airports, a move ordered by President Trump over the weekend that has drawn criticism from aviation and labor groups.
Oklahoma Governor Kevin Stitt will be responsible for appointing a replacement to fill Mullin’s vacated Senate seat, a decision that could affect the Senate’s narrow Republican majority in upcoming legislative votes.