"This race is far from over," she told her supporters at a post-election party in Concord, challenging Trump to debate her. "I'm a fighter. And I'm scrappy. And now we're the last one standing next to Donald Trump."

At his own party in Nashua, Trump opened his speech by mocking Haley, calling her an "imposter" and saying, "She's doing, like, a speech like she won. She didn't win. She lost. ... She had a very bad night." His remarks followed a series of angry posts on his Truth Social app, calling her "DELUSIONAL."

Haley had hoped the Northeastern state's sizable cadre of independent voters would carry her to an upset win that might loosen Trump's iron grip on the Republican Party.

Instead, Trump will become the first Republican to sweep competitive votes in both Iowa - where he won by a record-setting margin eight days ago - and New Hampshire since 1976, when the two states cemented their status as the first nominating contests.

With 41 percent of the expected vote tallied, according to Edison, Trump held a comfortable 54.7 percent to 43.7 percent lead.

While the final margin was still unclear, the result will likely bolster some Republicans' calls for Haley to drop out of the race and allow the party to coalesce behind Trump. Her campaign vowed in a memo earlier on Tuesday to push forward until "Super Tuesday" in early March, when Republicans in 15 states and one territory vote on the same day.

The next competitive contest is scheduled for Feb. 24 in South Carolina, where Haley was born and served two terms as governor. Despite her ties, however, Trump has racked up endorsements from most of the state's Republican figures, and opinion polls show him with a wide lead.

In Iowa, Haley finished just behind the second-place Florida Governor Ron DeSantis while focusing much of her early campaign on New Hampshire, where the more moderate electorate was expected to offer perhaps her best chance of winning a state over Trump. 

DeSantis, once seen as Trump's most formidable challenger, dropped out on Sunday and endorsed Trump. Though DeSantis had only marginal support in New Hampshire, his voters were far more likely to switch allegiance to Trump, rather than Haley, according to polls.

Meanwhile, Edison projected Biden would win the New Hampshire Democratic primary based on write-in votes, after he declined to appear on the ballot due to a dispute with the state about the election's timing.

Despite Trump's win on Tuesday, exit polls hinted at his potential vulnerabilities in a general election campaign. He faces four sets of criminal charges for a range of offenses, including his efforts to overturn his 2020 defeat and his retention of classified documents after leaving the White House in 2021.

About 44 percent of voters who participated in the Republican primary said he would not be fit to serve if convicted in court, according to exit polling by Edison.

More than half said they do not believe Biden legitimately won the 2020 election, echoing Trump's false claims that the result was tainted by fraud.

There were also warning signs for Biden, however. Nearly three-quarters of Republican primary voters said the economy was either poor or not good, an area where Biden has struggled to highlight his administration's accomplishments.

Republicans made up a smaller share of voters in the primary relative to the state's 2016 Republican contest in the state, the exit polls showed. Some 49 percent of voters considered themselves Republican, compared to 55 percent in the 2016 primary. Six percent said they considered themselves Democrats, compared to 3 percent in 2016. The share of independents was little changed at 45 percent.

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