Oklahoma Governor Kevin Stitt appointed energy executive Alan Armstrong to temporarily fill the U.S. Senate seat left by Mullin’s confirmation as Homeland Security secretary, with Armstrong set to serve the remainder of Mullin’s term and barred from running in a full term this fall.

Armstrong is portrayed as an even-tempered leader with deep energy-industry knowledge, expected to navigate global oil market dynamics and Iran-related energy considerations.

Armstrong’s appointment was guided by Stitt’s discussions with national leaders, including former President Trump, and aims to secure a bipartisan-friendly voice on permitting reform and energy policy.

Armstrong’s background includes extensive ties to the energy sector and a track record of working with Trump administration officials, reinforcing his fit for the job.

Stitt emphasized Armstrong’s Oklahoma roots and bipartisanship, framing the appointment as a chance to advance permitting reform and bolster the state’s representation in Washington.

The event announcing the appointment was held at the Oklahoma State Capitol, with accompanying media coverage.

Armstrong’s governance style is described as businesslike and pro-free markets, with a focus on easing permitting to accelerate infrastructure growth.

Stitt noted he consulted with Trump and Thune before finalizing the appointment, signaling energy policy and regulatory priorities for Oklahoma in Washington.

Armstrong, a longtime Williams Companies executive with no prior elected office, positions permitting reform for large infrastructure projects as a top priority to boost U.S. competitiveness.

Trump’s relationship with Stitt and its potential influence on optics of the appointment are noted, though Trump has no formal authority over the process.

Armstrong cited past collaboration with Trump-era energy and interior officials as factors supporting his nomination, and he has contributed to Stitt’s campaigns.