Julia Letlow and former congressman John Fleming will square off in the Republican runoff to win Louisiana's U.S. Senate seat.
The race selects a successor to retiring Senator Bill Cassidy.
Letlow has the backing of former President Donald Trump.
Fleming says he is a contender to the Trump‑backed candidate.
Voters have witnessed both candidates travel across the state.
The contest will demonstrate how much sway Trump still has with Louisiana GOP voters.
The runoff decides who will occupy in the Senate next.