Julia Letlow and former congressman John Fleming are poised to square off in the Republican runoff for Louisiana's U.S. Senate seat.
The race selects a successor to retiring Senator Bill Cassidy.
Letlow has the support of former President Donald Trump.
Fleming says he is a challenger 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 sit in the Senate next.