George P Bush is the young, half-Hispanic, grandson of the 41st president, nephew of the 43rd and son of a former Florida governor.

When he was elected Texas land commissioner four years ago, that background gave him a significant advantage as a fledgling Republican candidate seemingly on a fast track to stardom. Now, with conservative politics turned on its head by Trumpism, Bush is facing a tough primary election that threatens to doom his political career – and with it, bring to a close his family’s 70-year political dynasty.