Nikki Haley is suspending her US presidential campaign, making Donald Trump the last Republican left in the race.
It comes after President Joe Biden and Trump swept the state primaries that were held on Super Tuesday, making a White House rematch between them even more likely.
Haley pitched herself as a fresh start for the party and the chance to move past Mr Trump, but only won Vermont and the District of Columbia.
Biden won Democratic nominating contests in 14 states – plus Iowa, where people voted by post – but lost in the territory American Samoa by 11 votes.
Meanwhile, Trump won 14 Republican contests.
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