Despite a late challenge by Texas Senator Ted Cruz, Donald Trump won the primary and netted all 58 delegates in the winner-take-all contest.

There was controversy surrounding the Arizona primary elections of 2016, specifically having to do with the decrease in polling places in Maricopa County from 200 in 2012 to only 60 in 2016, despite the number of registered voters having increased from 300,000 in 2012 to 800,000 in 2016.

[5] Taking into account the effects of the Supreme Court's "gutting of the Voting Rights Act",[6] it's unknown what percentage of the provisional ballots were counted in 2016.

As The New York Times described, "Mr. Trump proved his appeal among immigration hard-liners, who make up a large bloc of Republicans in the border state.

He enjoyed support from former Arizona Governor Jan Brewer and Maricopa County Sheriff Joe Arpaio, both of whom hold a hard-line stance against immigration.