May 17 (UPI) -- Sen. Bill Cassidy, a 15-year veteran of the U.S. Congress, lost Louisiana's Republican primary this weekend and appeared to take aim at President Donald Trump in his concession speech.

Trump-backed Rep. Julia Letlow and Louisiana Treasurer John Fleming top Sen. Bill Cassidy, who is defeated in bid for GOP Senate nomination

Trump-backed Rep. Julia Letlow and Louisiana Treasurer John Fleming top Sen. Bill Cassidy, who is defeated in bid for GOP Senate nomination

May 16 - U.S. Senator Bill Cassidy, a Republican moderate targeted for retribution by President Donald Trump, will find out whether he can survive a primary election in Louisiana on Saturday against two popular rivals, including a Trump-backed challenger, or become the first elected Senate incumbent to lose renomination in more than a decade. Read more at straitstimes.com. Read more at straitstimes.com.

May 16 - U.S. Senator Bill Cassidy, a Republican moderate targeted for retribution by President Donald Trump, will find out whether he can survive a primary election in Louisiana on Saturday against two popular rivals, including a Trump-backed challenger, or become the first elected Senate incumbent to lose renomination in more than a decade. Read more at straitstimes.com. Read more at straitstimes.com.

Republican Sen. Bill Cassidy of Louisiana is fighting for his political life in Saturday's primary against a challenger who has been endorsed by President Donald Trump.