President Donald Trump on Sunday endorsed former Sen. John E. Sununu in New Hampshire’s open Senate race, boosting a longtime critic over one of his former ambassadors, Scott Brown.

Trump hailed Sununu, who Republicans see as their best chance to flip the blue Senate seat, as an “America First Patriot” in a Truth Social post Sunday afternoon. And Trump said Sununu will “work tirelessly to advance our America First Agenda.”

“John E. Sununu has my Complete and Total Endorsement — HE WILL NOT LET YOU DOWN. MAKE AMERICA GREAT AGAIN — ELECT JOHN E. SUNUNU,” he posted.

Sununu, a moderate