Polls are open from 6:30 a.m. to 7:30 p.m. Eastern. As of Friday, about 4% of voters had already cast early votes.
First results, usually of early voting, are expected shortly after polls close.
If no candidate receives more than 30% of the vote Tuesday, the candidate who receives the second-highest number of votes may demand a second primary, which would take place July 9.
Voters here lean heavily Republican. President Donald Trump won the district by 24 percentage points in 2016.
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This article originally appeared in The New York Times.