Trump-backed John Sununu wins New Hampshire Republican Senate primary

John E. Sununu at an event in Berlin, New Hampshire, last month. Photograph: Holly Ramer/AP

Former senator John E Sununu triumphed on Tuesday in the New Hampshire Republican Senate primary over Scott Brown, earning the GOP nod in what will probably be a must-win race if Democrats hope to seize the upper chamber.

Sununu, 61, was the clear frontrunner in the GOP primary. He served one term in the Senate from 2003 to 2009.