The 2016 Arizona primary took place on March 22, 2016, as part of the nominating process for the 2016 United States presidential election.
Hillary Clinton was declared the winner on the Democratic side, Donald Trump won on the Republican side, and the Green party chose Jill Stein as their candidate.
There was controversy surrounding the Arizona primary elections of 2016, specifically having to do with the dramatic decrease in polling places 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] This was the first election in the state of Arizona since the 2013 Supreme Court decision to strike down Section 5 of the Voting Rights Act of 1965, which would have previously required states with a history of voter discrimination, including Arizona, to receive Federal approval before implementing any changes to voting laws and practices.
As a result of the controversy surrounding the Arizona primary, Phoenix mayor Greg Stanton asked the Justice Department to launch an investigation into the allegations of voter suppression.