Ted Cruz isn’t just colliding with Donald Trump since the Republican convention. He’s also at odds with some of his own advisers. At issue: a high-profile primary challenge to Kansas Rep. Tim Huelskamp, a Cruz ally and tea party favorite who has long been a thorn in the side of the party establishment. Cruz has rushed to Huelskamp’s aid, providing him with a valuable endorsement just weeks before the Aug. 2 primary. But members of the Texas senator’s political team are working aggressively to defeat the embattled congressman. Two of the pillars of Cruz’s political operation, the consulting firms Axiom...