CONCORD, N.H. — Donald Trump’s effort to march to the Republican presidential nomination faces perhaps its greatest challenge on Tuesday when voters in New Hampshire hold the first-in-the-nation primary.

       The former president enters the contest emboldened by his record-setting performance in last week’s Iowa caucuses. But New Hampshire has a more moderate political tradition and primary rules that allow unaffiliated voters to participate in the race. Trump-backed MAGA candidates have struggled here in recent years.

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       Nikki Haley is hoping to capitalize on those vulnerabilities. The former U.N. ambassador is the only candidate left in the GOP primary aiming to defeat Trump outright. After a disappointing finish in Iowa, Florida Gov. Ron DeSantis is effectively surrendering new Hampshire and focusing on South Carolina’s Feb. 24 primary.