Voting in the Democratic and Republican primaries has begun in Arizona, where the polls opened at 6:00 a.m. local time and will close at 7:00 p.m.
There are 58 Republican delegates at stake in Arizona, and the winner takes them all. There are 85 Democratic delegates.
Currently, Hillary Clinton and Donald Trump have substantial leads over their opponents, but as we've seen in recent elections, polls can be wrong.
Stay tuned for continuing coverage of the Arizona primary.