Ryan endorses Simpson in Idaho primary
© Greg Nash

Rep. Paul RyanPaul Davis RyanConservatives leery of FBI deal on informant Overnight Health Care — Sponsored by PCMA — House passes 'right to try' drug bill | Trump moves to restrict abortion referrals Hillicon Valley: Trump claims 'no deal' to help Chinese company ZTE | Congress briefed on election cyber threats | Mueller mystery - Where's indictment for DNC hack? | Zuckerberg faces tough questions in Europe MORE (R-Wis.) on Tuesday endorsed Rep. Mike SimpsonMIchael (Mike) Keith SimpsonHouse panel votes to boost funding for Energy Dept., Army Corps Live coverage: Pruitt faces grilling in House hearings Green Party puts Dem seat at risk in Montana 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.