President Donald Trump on Thursday formally endorsed former U.S. Sen. John. Sununu in the Republican primary for New Hampshire’s open U.S. Senate seat, injecting the authority of a sitting president directly into a race that is already shaping up to be one of the most competitive contests of the 2026 cycle.
Trump announced in a lengthy Truth Social post Sunday afternoon, throwing his full support behind Sununu and urging Republicans to unite behind his candidacy as the primary field continues to take shape.
“It is my Great Honor to endorse America First Patriot, John E. Sununu, who is running to represent the beautiful State of New Hampshire in the U.S. Senate.John is strongly supported by the most Highly Respected Leaders in New Hampshire, and many Republicans in the U.S. Senate and, as your next Senator, he will work tirelessly to advance our America First Agenda. John will fight hard to Grow the Economy, Cut Taxes and Regulations, Advance MADE IN THE U.S.A., Unleash American Energy DOMINANCE, Provide Access to Affordable and High Quality Health Care, Champion School Choice, Keep our Border SECURE, Stop Migrant Crime, Support our Brave Military, Veterans, and Law Enforcement, Ensure LAW AND ORDER, and Defend our always under siege Second Amendment.John E. Sununu has my Complete and Total Endorsement — HE WILL NOT LET YOU DOWN. MAKE AMERICA GREAT AGAIN — ELECT JOHN E. SUNUNU!”
Trump’s endorsement lands as Sununu already holds a commanding lead in the Republican primary, according to the most recent Granite State Poll conducted by the University of New Hampshire Survey Center in January.
Among likely Republican primary voters, Sununu leads former Massachusetts Sen. Scott Brown by a wide margin. The poll shows 48 percent backing Sununu, compared to 25 percent for Brown, with 26 percent undecided. Sununu also enters the race with a strong favorability profile among GOP voters, with 53 percent holding a favorable view and just 14 percent viewing him unfavorably.
The same polling suggests a competitive general election environment. In a hypothetical matchup against Democrat Rep. Chris Pappas, Sununu trails narrowly statewide, with 50 percent of likely voters backing Pappas and 45 percent supporting Sununu, a margin within the survey’s error range.
With Trump now publicly and unequivocally behind him, Sununu moves from primary frontrunner to the clear standard bearer of the Republican field. In a state where endorsements matter and Republican voters take cues seriously, the president’s backing is likely to accelerate consolidation behind Sununu and reshape the trajectory of the New Hampshire Senate race.
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