Due to numerous personal and legal problems, Bush had only played as high as Double-A, two steps below the Major League level, prior to his debut on May 13, 2016. He was traded by the Padres to the Toronto Blue Jays in 2009, but was released by the Blue Jays without ever playing. He then played for the Rays organization before being released in 2012 after a drunk driving incident. He pleaded no contest to charges related to that incident in December 2012, and was sentenced to 51 months in state prison. He served 39 months, and signed with the Rangers after his release from prison.

Bush attended Mission Bay High School in San Diego, California. He played shortstop, where his defense and arm strength made him a top major league prospect. He had a .450 batting average with 11 home runs and 35 runs batted in (RBIs). He also pitched, and he threw a 94 mph fastball with a solid curveball. Bush had a 5–1 win–loss record with two saves and a 0.73 earned run average (ERA). Bush was considered one of the best five-tool players ever to come out of high school.

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