Ms. Haley, 51, a former South Carolina governor and a United Nations ambassador in the Trump administration, called for “generational change” in the party.Nikki Haley, the former South Carolina governor and United Nations ambassador, entered the race for president on Tuesday, a well-hinted-at move that is likely to leave her as the lone major Republican challenger to former President Donald J. Trump for many weeks, if not months, as other potential 2024 rivals bide their time.By announcing her campaign early, Ms. Haley, 51, who called for “generational change” in her party, seized an opportunity for a head start on fund-raising and to command a closer look from Republican primary voters, whose support she needs if she is to rise from low single digits in early polls of the G.O.P. field.She made the announcement in a video that does not mention Mr. Trump’s name, but makes clear her intention to break with the Trump era. In addition to calling for a new generation to step up, she urged Republicans to rally around substantive issues and a candidate with appeal to mainstream America.“Republicans have lost the popular vote in seven out of the last eight presidential elections,” she said. “That has to change.”Ms. Haley’s campaign has drawn encouragement from many polls showing that in a hypothetical multicandidate field, Mr. Trump wins less than 50 percent of Republican voters. Her entry into the race underscores how the former president has failed to scare off rivals in his third presidential campaign, announced in November after a disappointing midterm election for Republicans.Her announcement reversed a statement in 2021 that she would not run if Mr. Trump were a candidate. She was a rare figure to leave the Trump administration while earning praise from Mr. Trump rather than a parting insult. Mr. Trump recently said that when Ms. Haley informed him she was considering a run, he told her, “You should do it.’’That the former president has so far not coined an insulting nickname or otherwise attacked Ms. Haley is a sign, perhaps, that he does not perceive her as a major threat.Since leaving the Trump administration in 2018, Ms. Haley has walked a fine line with the former president, praising his policies and accomplishments in office while offering criticism that appeals to Republican moderates. The day after the Jan. 6, 2021, attack on the Capitol, she said his actions “will be judged harshly by history.”But she opposed his impeachment for his actions surrounding the riot. “At some point, I mean, give the man a break,” she said on Fox News in late January 2021.In interviews last month, Ms. Haley swiped at the advanced age of both Mr. Trump, 76, and President Biden, 80. “I don’t think you need to be 80 years old to go be a leader in D.C.,” she told Fox News.The Run-Up to the 2024 ElectionThe jockeying for the next presidential race is already underway.G.O.P. Field: For months, Donald J. Trump has been the lone Republican to formally enter the 2024 presidential contest, but that is about to end. Here is a look at who is eyeing a run.DeSantis’s Challenge: Gov. Ron DeSantis has pursued a strategy of conflict avoidance with Mr. Trump in the shadow G.O.P. primary. But now he faces the pressing question of how long this approach can work.Education Issues: Mr. Trump and Mr. DeSantis are seizing on race and gender issues in schools, but such messages had a mixed record in the midterms.Harris’s Struggles: With President Biden appearing all but certain to run again, concerns are growing over whether Kamala Harris, who is trying to define her vice presidency, will be a liability for the ticket.To advance into the top tier of Republican presidential hopefuls, Ms. Haley’s campaign is banking on her skills as a retail campaigner in early nominating states. She is traveling to New Hampshire after a rally planned in South Carolina on Wednesday, for two town hall-style events, and she plans to be in Iowa next week.Ms. Haley was largely a bystander as cultural battles enveloped Republican primary races in 2022 and as Gov. Ron DeSantis of Florida, Mr. Trump’s leading potential rival, has increasingly leaned into such issues to stoke support from the G.O.P. base.But now she is jumping into the cultural fray, using her 3-minute 33-second announcement video to criticize those who say “our founding principles are bad” — text that was laid over images of Representative Alexandria Ocasio-Cortez, Democrat of New York, and the “1619 Project,” an interpretation of U.S. history, created by The New York Times, that focuses on the consequences of slavery.Ms. Haley, who is best known on the national stage for pursuing Mr. Trump’s foreign policy agenda for two years at the United Nations, is seeking to broaden her following through such cultural appeals, denouncing Democrats as pushing “socialism” in government and “wokeism” in schools. At the same time, she highlights her biography as the daughter of immigrants who rose to be South Carolina’s first female governor, and first nonwhite governor, as a rebuke of liberal arguments that America harbors systemic racism.“I was the proud daughter of Indian immigrants, not Black, not white,” Ms. Haley, who was born in Bamberg, S.C., says in the announcement video..css-1v2n82w{max-width:600px;width:calc(100% – 40px);margin-top:20px;margin-bottom:25px;height:auto;margin-left:auto;margin-right:auto;font-family:nyt-franklin;color:var(–color-content-secondary,#363636);}@media only screen and (max-width:480px){.css-1v2n82w{margin-left:20px;margin-right:20px;}}@media only screen and (min-width:1024px){.css-1v2n82w{width:600px;}}.css-161d8zr{width:40px;margin-bottom:18px;text-align:left;margin-left:0;color:var(–color-content-primary,#121212);border:1px solid var(–color-content-primary,#121212);}@media only screen and (max-width:480px){.css-161d8zr{width:30px;margin-bottom:15px;}}.css-tjtq43{line-height:25px;}@media only screen and (max-width:480px){.css-tjtq43{line-height:24px;}}.css-x1k33h{font-family:nyt-cheltenham;font-size:19px;font-weight:700;line-height:25px;}.css-1hvpcve{font-size:17px;font-weight:300;line-height:25px;}.css-1hvpcve em{font-style:italic;}.css-1hvpcve strong{font-weight:bold;}.css-1hvpcve a{font-weight:500;color:var(–color-content-secondary,#363636);}.css-1c013uz{margin-top:18px;margin-bottom:22px;}@media only screen and (max-width:480px){.css-1c013uz{font-size:14px;margin-top:15px;margin-bottom:20px;}}.css-1c013uz a{color:var(–color-signal-editorial,#326891);-webkit-text-decoration:underline;text-decoration:underline;font-weight:500;font-size:16px;}@media only screen and (max-width:480px){.css-1c013uz a{font-size:13px;}}.css-1c013uz a:hover{-webkit-text-decoration:none;text-decoration:none;}How Times reporters cover politics. We rely on our journalists to be independent observers. So while Times staff members may vote, they are not allowed to endorse or campaign for candidates or political causes. This includes participating in marches or rallies in support of a movement or giving money to, or raising money for, any political candidate or election cause.Learn more about our process.Ms. Haley’s father, Ajit Singh Randhawa, and her mother, Raj Kaur Randhawa, are immigrants from the Punjab region of India, who moved to South Carolina when her father accepted a teaching job at a historically Black college. Raised in the Sikh faith, Ms. Haley converted to Christianity after she married Michael Haley in 1996.After graduating from Clemson University, Ms. Haley worked for her family’s dress boutique, including as bookkeeper, before winning the first of three terms in the South Carolina House of Representatives.She was first elected governor in 2010, originally entering the Republican primary as an underdog but with the support of the departing incumbent, Mark Sanford. She was trailing in primary polls when an endorsement from Sarah Palin, the former Alaska governor, helped lift her to the nomination.In her second term, after a mass shooting in 2015 at an African American church in Charleston by a white supremacist, Ms. Haley called for the removal of the Confederate battle flag from the State Capitol.As a former South Carolina governor, Ms. Haley is theoretically well positioned for the state’s 2024 primary, the third nominating contest and the one that has historically culled the Republican field.But things could be complicated in her home state, whose conservative Republican voters fully embraced Mr. Trump in 2016. There is also the potential competition from another home state candidate, Senator Tim Scott, who is thought to be exploring a presidential run and has proved to be a formidable fund-raiser.Curtis Loftis, the South Carolina treasurer and a Trump backer, said there was little chance the former president would lose the 2024 primary there. “I’m not aware of many Republicans that would be Haley supporters over Trump supporters,” he said. “You have a lot of people who are independents. They’ll be with Nikki as opposed to President Trump.”But Wes Climer, a state senator and Haley supporter, said she could “absolutely” win the South Carolina primary if she did well in Iowa and New Hampshire. “She’s an outstanding retail candidate, and the presidential race tends to reward those skills,” he said.Other Republicans exploring presidential campaigns include Mr. DeSantis; former Vice President Mike Pence; and Mike Pompeo, a former secretary of state and C.I.A. director under Mr. Trump. Governors Chris Sununu of New Hampshire and Glenn Youngkin of Virginia are also thought to be eyeing a run, along with former Gov. Larry Hogan of Maryland.In early polls, which are partly a reflection of name recognition, Ms. Haley has been in the low single digits. She was the choice of 1 percent of Republican voters in a Monmouth University poll this month that showed Mr. Trump and Mr. DeSantis tied at 33 percent, with all other potential rivals at 2 percent or less. One out of four Republicans was undecided.Ms. Haley has long been a favorite of Republican donors. A political action committee she created in 2021 to build a donor list, support midterm candidates and pay for her political travel, Stand for America PAC, has raised $17 million.By comparison, Mr. DeSantis had about $64 million left from his record-shattering fund-raising for his re-election campaign last year; that money can potentially be rolled into a federal race. Mr. Pence, since leaving the White House, has raised $1.2 million through a political action committee (which spent $91,000 on copies of his recent memoir).The executive director of Ms. Haley’s PAC, Betsy Ankney, a former political director of the National Republican Senatorial Committee, will manage Ms. Haley’s campaign, which is based in Charleston, S.C. Others on Ms. Haley’s political team include Jon Lerner, her pollster and a senior consultant, and Chaney Denton, her longtime spokeswoman.A second political group Ms. Haley created, a nonprofit with a similar name to her PAC that is not required to publicly disclose supporters, took in contributions of $250,000 and more from major donors in 2019, according to information disclosed to Politico. The donors included the casino mogul Sheldon G. Adelson (before his death in 2021), the hedge fund manager Paul Singer and the investor Stanley Druckenmiller and his wife, Fiona Druckenmiller.During the 2016 Republican presidential primary, in which Ms. Haley first backed Senator Marco Rubio of Florida, she got into a high-profile spat with Mr. Trump after calling for him to release his tax returns. Mr. Trump, on Twitter, called her an embarrassment to South Carolina. “Bless your heart,” Ms. Haley tweeted back at him.But Ms. Haley went on to endorse Mr. Trump when he became the nominee, and he named her as his United Nations ambassador in 2017. She vowed to take on foreign adversaries in her announcement video, describing China and Russia as “on the march.”“They all think we can be bullied, kicked around,” Ms. Haley says in the video. “You should know this about me: I don’t put up with bullies. And when you kick back, it hurts them more if you’re wearing heels.”The first Indian American to hold a cabinet-level post, she earned respect from colleagues from other nations, even those who disagreed with the Trump administration’s foreign policy. Speaking at the United Nations in September 2018, Mr. Trump was laughed at when he boasted of his administration’s achievements.Ms. Haley’s departure later that year was viewed as her taking the next step toward a long-anticipated presidential run. More