Ryan endorses Simpson in Idaho primary
© Greg Nash

Rep. Paul RyanPaul Davis RyanElection Countdown: Takeaways from heated Florida governor's debate | DNC chief pushes back on 'blue wave' talk | Manchin faces progressive backlash | Trump heads to Houston rally | Obama in Las Vegas | Signs of huge midterm turnout Will the Federal Reserve make a mistake by shifting to inflation? Sanders: Democrats ‘absolutely’ have chance to win back rural America  MORE (R-Wis.) on Tuesday endorsed Rep. Mike SimpsonMIchael (Mike) Keith SimpsonOvernight Energy: Trump reportedly set to weaken methane rule | Exxon appeals climate case to Supreme Court | California commits to 100 percent clean energy | Tribes sue over Keystone XL pipeline Overnight Energy: EPA watchdog to probe Superfund panel | Zinke opens more wildlife refuges to hunting | House to vote on energy spending bill next week GOP shrugs off Trump shutdown threat 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.