Utah Republican Sen. Mitt Romney said Wednesday that he will not run for reelection, ending a storied two-decade political career that included the 2012 Republican GOP nomination for president and a term as Massachusetts governor.

Romney, 76, said the country's many challenges call for a younger generation of leaders. He said the U.S. would be better served if the two front-runners for their parties' 2024 presidential nominations — Democratic President Joe Biden and Republican former President Donald Trump — stepped aside.

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