BOISE, Idaho (AP) — Republican U.S. Sen. Jim Risch from Idaho says he's throwing his support behind fellow GOP Sen. Marco Rubio for president.

Risch announced his endorsement of the Florida politician on Wednesday. Risch says he's been impressed with Rubio's communication skills and understanding of serious issues while working together in the U.S. Senate.

The support from Risch, a former Idaho governor, comes on the heels of also receiving endorsements earlier this week from Republican U.S. Sens. Steve Daines from Montana and Cory Gardner of Colorado.