Florida Republican Marco Rubio, who lost his party's nomination for president to Donald Trump, may at least keep his job in the U.S. Senate.
Rubio defeated millionaire builder and rookie politician Carlos Beruff in the state's Republican primary election Tuesday.
Rubio entered the Republican race just days before the deadline. He had told his supporters he would not run for another six-year term after failing to win the presidential nomination.
In November, Rubio will face off against the winner of the Democratic primary, U.S. Representative Patrick Murphy.
Murphy had the backing of President Barack Obama and beat another U.S. congressman, ultraliberal Alan Grayson, to win the nomination.
In the nation's other closely watched primary election, veteran Republican Senator John McCain of Arizona is looking to hold off a challenge from three other candidates as he seeks his sixth term in the Senate.