As the junior senator from Oklahoma, Sen. Markwayne Mullin (R-OK), 47, has amassed an unusual level of clout in a chamber that values seniority.

The former MMA fighter and father of six has found his place in Washington, D.C., with an ease that crosses every dividing line in politics. He’s forged relationships in both chambers, running a long-standing workout in the House gym, and even counts President Donald Trump as a close friend.