Nikki Haley won the Republican presidential primary election in Washington DC on Sunday, defeating former United States President, Donal Trump.

The victory of Haley in the nation’s capital comes just ahead of a decisive day in the long U.S. nominating process – Super Tuesday, in which 15 states and one territory vote.

Washington is a solidly Democratic town with a small number of registered Republicans. CNN, which was among outlets reporting that Haley, a former governor of South Carolina, won on Sunday, put it at just 22,000.

Haley, in her first victory, took 63 per cent of the votes in a primary held in just one place – a downtown hotel, according to Politico, which quoted Washington party officials.

In the 2020 election against Trump, then-candidate Joe Biden won 92 per cent of the votes in Washington DC.

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The city has never produced a majority vote for a Republican presidential candidate, according to AFP.

The Haley campaign, in a statement, said: “It’s not surprising that Republicans closest to Washington dysfunction are rejecting Donald Trump and all his chaos.”

Trump’s campaign in turn released what it called a “statement on Nikki Haley Being Crowned Queen of The Swamp”.

“Tonight’s results in Washington DC reaffirm the object of President Trump’s campaign – he will drain the swamp and put America first,” the statement said.

The Super Tuesday milestone is expected to leave Trump a hair’s breadth from securing the Republican Party’s presidential nomination. He has already swept all the early state primaries.

Super Tuesday is seen as the last real chance for Haley to upend the former president’s march towards becoming the party’s flagbearer once again, against Biden.

The Star