Context:

House GOP Policy Committee Chairman Kevin Hern formally enters the U.S. Senate race for Mullin’s seat as Mullin is tapped by President Trump to lead Homeland Security, setting up a November contest in a ruby-red Oklahoma. Mullin’s departure will create an open seat soon to be filled by the governor, with Oklahoma’s process requiring an appointee to swear they won’t run in the next election. Republican leadership aims to fill Mullin’s seat promptly, while potential contenders weigh campaigns, including Rep. Stephanie Bice. Hern touts Trump-aligned credentials and mobilizes prominent backers, as the party assesses primary dynamics and confirmation hurdles. A March 31 deadline shapes the timeline for Mullin’s move and Noem’s exit, with the full Senate vote still uncertain.

Dive Deeper:

• Kevin Hern, the House GOP Policy Committee Chairman, publicly launched his Senate bid for the seat Mullin will vacate, presenting himself as a strong ally of President Trump and a candidate trained to secure border security, law enforcement support, and economic affordability.

• Mullin is set to leave the Senate after being nominated by Trump to lead the Department of Homeland Security; he faces a confirmation hearing, while Oklahoma’s governor will appoint a temporary replacement to serve the remainder of Mullin’s term.

• Oklahoma’s appointment rules differ from the typical system: the governor must appoint someone who signs an affidavit stating they will not run in the next election, complicating early horse-trading for the open seat with Mullin’s term ending in 2026.

• Hern has secured early endorsements from several senators and has recruited campaign veteran Tony Fabrizio as senior advisor, signaling a well-organized bid and substantial infrastructure for a crowded GOP field.

• Senate leaders, including John Thune, are prioritizing a quick fill of Mullin’s seat, with plans to consult Gov. Kevin Stitt; the timeline emphasizes rapid moves toward a final appointment before the November election.

• Stephanie Bice has floated a potential run but has not committed, leaving open a question about the race’s crowded nature and whether additional prominent Republicans will enter before the primary.

• Trump has set a March 31 deadline related to Mullin’s transition and Noem’s exit, and Mullin’s path through the Homeland Security and Governmental Affairs Committee remains a key milestone for the full Senate vote.