Ambassador to Japan Bill Hagerty rode the endorsement from President Trump to victory Thursday in a hotly contested Republican Senate primary in Tennessee.
Republicans are heavily favored to keep the seat, considering the GOP has held both Tennessee Senate seats since 1994.
Last July, Trump let Tennessee voters know he would back Hagerty for the seat, months before he declared himself a candidate.
Hagerty was backed by big political names with campaign cash, including Sen. Alexander through his PAC and former Gov.
Fox News' Paul Steinhauser and The Associated Press contributed to this report.