WaPo:

It was one of the first claims President-elect Donald Trump made about voter fraud in the wake of his 2016 victory: that his whisker-thin loss in New Hampshire was propelled by thousands of illegal ballots cast by out-of-state voters.
Trump’s revival of that false assertion as he ramps up his reelection campaign is now alarming some New Hampshire Republicans, who fear that the president’s allegations could undermine confidence in next year’s election.
“People hold riots after their favorite football team loses the Super Bowl,” said Fergus Cullen, a former New Hampshire GOP chairman and Trump critic. “There’s just no telling what people will do when they’re incited to it. We’ve never been in a situation like this, where there’s so much dry kindling across the landscape and we’ve got someone all too willing to light the match.”