Polls across Nevada are open on Election Day from 7:00 a.m. to 7:00 p.m.
Washoe County's initial preliminary results will not be released until every poll in Nevada closes.
The results will not be official until the canvass of the vote on June 24.
Meanwhile, primary voters will decide the fate of two South Carolina Republicans who are clinging to their seats in the U.S. House after defying Donald Trump.
And in Maine, a bellicose former governor who once said he was “Trump before Trump” has come out of his retirement in Florida to challenge a nemesis for his old job.
(The Associated Press contributed to this report.)