As George P. Bush was ramping up his runoff campaign in the Republican attorney general’s race in March, he jumped on a Fox Business Network interview to advocate for stricter border security, pledging to build “miles and miles” of border wall to combat the federal government’s “inactivity.”

Stuart Varney, the host conducting the interview, was skeptical.

“Sir, I always think of the Bush family as kind of the moderate wing of the Republican Party,” he said. “And now you want to finish Trump’s wall. Is that accurate?”....

Bush’s struggles highlight how politics in Texas have changed. For decades, the Bush family was GOP royalty. Bush’s grandfather, George H.W. Bush, first won office here in the ’60s. His uncle, George W. Bush, was an immensely popular governor. Both presidential Bushes have their libraries in the state.