Julia Letlow and former congressman John Fleming are set to 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 challenger to the Trump‑backed candidate.
Voters have seen each candidates travel across the state.
The contest will show the extent of sway Trump still has with Louisiana GOP voters.
The runoff decides who will hold in the Senate next.