Hern’s primary win, NBC News projects, makes him a heavy favorite to win Homeland Security Secretary Markwayne Mullin’s old Senate seat in November.

U.S. Rep. Kevin Hern of Oklahoma is hoping to win the Republican nomination for the Senate seat once held by U.S. Homeland Security Secretary Markwayne Mullin.

Hern’s primary win, NBC News projects, makes him a heavy favorite to win Homeland Security Secretary Markwayne Mullin’s old Senate seat in November.

Hern is likely to win in November to serve the remainder of now-Homeland Security Secretary Markwayne Mullin's term.

Kevin Hern wins the GOP primary for Oklahoma Senate with Trump's backing. Hern as nominee at 99.6% NO.