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MADISON, Wis. (AP) — House Speaker Paul Ryan is trying to fend off a challenge from a previously unknown Republican challenger who won praise from Donald Trump. Thanks largely to Trump, an expected walkover for the country's highest-ranking Republican officeholder became one to watch on Tuesday. Ryan is seeking to avoid the most shocking of upsets against a political unknown hoping for a Trump bump. Paul Nehlen's star rose after Trump praised him last week on Twitter, then later pointedly withheld his endorsement of Ryan. Trump relented just three days later, but the burst of publicity was priceless for Nehlen. No House speaker in modern political history has lost a primary, and Ryan is hugely popular in the southeastern Wisconsin district he has represented for nearly two decades.

Paul Ryan hopes to avert primary surprise after Trump tweak