Washington — Oklahoma Gov. Kevin Stitt appointed energy executive Alan Armstrong on Tuesday to replace newly confirmed Department of Homeland Security Secretary Markwayne Mullin in the Senate.

Markwayne Mullin is officially the new DHS secretary. The Oklahoma Republican was confirmed by the Senate on Monday in a 54 to 45 vote.

On Monday, Sen. Markwayne Mullin was confirmed as the newest head of the Department of Homeland Security, replacing Kristi Noem.

More than 400 Transportation Security Administration (TSA) officers have quit their jobs since the partial government shutdown began on Feb. 14, acting DHS Assistant Secretary Lauren Bis told the Dail...