Incumbent Bill Cassidy lost the Primary, while Republican candidates Julia Letlow and John Flemming, and Democrat candidate Jamie Davis, advance to runoff.

Source: Election results are from The Associated Press. County type designations are based on a New York Times analysis of data from the Census, the National Center for Health Statistics, and other ...

Source: Election results and race calls are from The Associated Press. County type designations are based on a New York Times ...

"This is the party of Donald Trump," he warned after one GOP colleague's historic defeat.

To President Trump's delight, two-term Republican Sen. Bill Cassidy lost his bid for re-election in Louisiana's primary on Saturday.