Ryan endorses Simpson in Idaho primary
© Greg Nash

Rep. Paul RyanPaul Davis RyanVulnerable Republicans include several up-and-coming GOP leaders Trump ally suspends reelection campaign Congress should prohibit members from serving on company boards MORE (R-Wis.) on Tuesday endorsed Rep. Mike SimpsonMIchael (Mike) Keith Simpson'Minibus' spending conference committee abruptly canceled Five things to know about efforts to repeal Obama's water rule Key conservative presses for shield law after seizure of NYT reporter’s records MORE (R-Idaho), giving him a boost against his Tea Party challenger.

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"Mike Simpson has been in the trenches fighting to reform runaway spending and has been a critical voice in passing our plan to balance the budget and pay down our debt," Ryan said in a statement released by Simpson's campaign.

Ryan is a favorite of conservatives, and Simpson, a close friend of Speaker John Boehner (R-Ohio), is looking to shore up his credentials on the right as he faces Tea Party candidate and attorney Bryan Smith (R).

Smith has the backing of the conservative Club for Growth and has raised more money than most other conservative primary challengers this election cycle. Simpson has been endorsed by the Chamber of Commerce, which has been airing ads on his behalf.