Barrasso previously served as the chair of the Republican Policy Committee.
With Texas Senator John Cornyn leaving his post as majority whip due to term limits, changes are coming up and down the pecking order.
Barrasso is the highest ranking Wyoming lawmaker in Washington, and now number three among all Republican senators.
He says this gives him more power to promote Wyomingites needs.
"I think it means more for Wyoming. I can continue to bring forth Wyoming’s agenda, the issues that affect our jobs and our economy, things that people care about in Wyoming." Said Senator Barrasso. "But it’s also an opportunity to continue to serve in the Senate with the other members of the Senate."
Senator Barrasso's current post will be filled by Senator Roy Blunt.
The new leadership team will assume their roles when the new Congress begins in January.