Pressing his advantage over Nikki Haley in the homestretch before the New Hampshire primary, Donald J. Trump will surround himself with South Carolina leaders, including Ms. Haley’s successor as governor, at a rally Saturday night to portray her as politically friendless at home, two Trump campaign officials said.

The former president plans the show of strength to add to his own momentum before Tuesday’s voting and to highlight Ms. Haley’s lack of support in her home state, the officials said, insisting on anonymity to discuss campaign strategy.

Gov. Henry McMaster of South Carolina, who endorsed Mr. Trump in November 2022, shortly after he announced his third presidential bid, will speak to voters in Manchester, N.H. He will be joined by the state’s lieutenant governor, attorney general, treasurer and the speaker of the South Carolina’s House of Representatives, along with three congressmen from the state.

One campaign adviser said that the traveling slate of South Carolinians was meant to help Mr. Trump make the case that he has presented since his landslide victory in Iowa: that overtaking him is so unlikely that his rivals should suspend their campaigns so he and the Republican Party can focus on defeating President Biden in November.

The guest appearances could humiliate Ms. Haley and further undermine her case for the nomination by illustrating how isolated she appears to be in her own state, where the Republican primary will be held on Feb. 24. And the South Carolina group backing Mr. Trump on Saturday will follow the state’s junior senator, Tim Scott, who endorsed Mr. Trump in Concord, N.H., on Friday.

Ms. Haley is not without support in South Carolina, where she served as governor from 2011 to 2017, when Mr. Trump appointed her as ambassador to the United Nations. She has the backing of Representative Ralph Norman and of Katon Dawson, a former state Republican chairman, along with a small number of South Carolina legislators.

Ms. Haley’s path to the nomination likely hangs on a victory or a close second-place finish in New Hampshire, where independent voters make up 40 percent of the electorate. Though Mr. Trump maintains a large lead in the polls, Ms. Haley has narrowed that lead recently, effectively making the primary a two-person race in the state.

But Ms. Haley would need to follow a strong performance in New Hampshire with another one in South Carolina, where Mr. Trump enjoys a large and loyal following. He leads in South Carolina polls by a wide margin and also can count on support there from Senator Lindsey Graham, a close ally.

The Trump campaign is eager to force both Ms. Haley and Gov. Ron DeSantis of Florida from the race before the South Carolina primary, hoping to avert what could otherwise be an expensive fight for delegates lasting through March.

As the New Hampshire primary nears, Mr. Trump has increasingly escalated and sharpened his attacks on Ms. Haley. He now often argues that while she did an adequate job in his administration, she does not have what it takes to lead her own.

”She is not presidential timber,” Mr. Trump said bluntly in Concord on Friday.

Mr. Trump has also repeatedly tried to backpedal on his past praise of Ms. Haley, claiming frequently that he only appointed her ambassador to the United Nations in order to clear the way for Mr. McMaster to become governor.

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