Mullin's DHS Nomination Creates Oklahoma Senate Vacancy: Stitt to Appoint Temporary Replacement
Mullin, elected in a 2022 special election after a decade in the House, requires Senate confirmation for DHS, effective March 31.
WASHINGTON – Sen. Markwayne Mullin's (R-Okla.) nomination as Department of Homeland Security Secretary has opened his Senate seat, prompting Gov. Kevin Stitt (R-Okla.) to appoint a temporary successor under state law, with speculation focusing on who will fill the role and compete for the full term in November 2026.
Mullin, elected in a 2022 special election after a decade in the House, requires Senate confirmation for DHS, effective March 31. Oklahoma law allows Stitt 30 days to appoint a Republican registered with the party for at least five years. The appointee must swear an oath not to run in the special or next regular election for the seat, serving until voters decide in November.
Stitt pledged to name a "strong, small government conservative" to support President Trump and protect Oklahomans' way of life. No shortlist has emerged, but the deep-red state's Republican dominance—holding all five House seats and top offices—suggests a reliable pick.
For the full term, potential candidates include Reps. Stephanie Bice (R-Okla.) and Kevin Hern (R-Okla.), both reportedly considering runs. Former Oklahoma House Speaker T.W. Shannon, defeated by Mullin in the 2022 GOP runoff, is also mentioned. The Cook Political Report rates the seat "Solid Republican," with Trump winning over 66% in Oklahoma in 2024.
The vacancy could ripple through House races if members pursue the Senate bid, highlighting Oklahoma's GOP strength amid Trump's cabinet transitions.