New US senator for Oklahoma sworn in, replacing Markwayne Mullin

By: Shauneen Miranda

Outlets: DC Bureau (States Newsroom)

Published: March 24, 2026

Words: 227

Last Updated: 4 months, 1 week ago

WASHINGTON — Alan Armstrong, a Tulsa businessman, was sworn in Tuesday as Oklahoma’s newest U.S. senator.

Armstrong temporarily fills the seat of Markwayne Mullin, who was sworn in as U.S. Department of Homeland Security secretary earlier Tuesday.

The Senate on Monday confirmed Mullin’s nomination to lead the agency responsible for carrying out President Donald Trump’s mass deportation agenda.

Armstrong was sworn in at the U.S. Capitol just hours after Oklahoma GOP Gov. Kevin …

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