New Hampshire election data shows at least 458 people who cast ballots on Election Day may have lied about their residency, figures that support President Trump’s repeated claims of “serious voter fraud” in the Granite State.

Voters can cast ballots in New Hampshire on Election Day without a state ID, and recently released state data show 5,903 people produced out-of-state licenses to vote in 2016. Those who vote without a state ID must show proof of their residency in state, and those who can’t must sign a legal document stating where they live, NH 1 reports.

After the November election, the New Hampshire Secretary of State followed up with 6,033 letters to voters with no proof of domicile and so far 458 of the letters have bounced back as undeliverable – a clear sign those who filled them out lied.

NH 1 reports:

It’s worth noting that the 458 undeliverable letters is down from 1,193 four years ago, when a new law allowing the follow up from the Secretary of State’s office was implemented for the first time.

The Secretary of State’s office also sent out 764 letters following this past November’s election to voters who cast a ballot without a satisfactory photo identification. There is no information yet on how many of those letters were returned undeliverable.

New Hampshire Deputy Secretary of State Dave Scanlan attempted to play down the impact.

“We don’t really see any widespread voter fraud taking place in New Hampshire,” he told the news station. “Does it happen in isolated instances? I think the answer is yes. There have been prosecutions in the past.”

And while it remains unclear whether there’s prosecutions looming for those who gamed the system in 2016, it’s compelling evidence for Trump’s claims about voting fraud.

In late November, Trump tweeted: “Serious voter fraud in Virginia, New Hampshire and California – so why isn’t the media reporting on this? Serious bias – big problem!”

He followed up the remarks in February by alleging out-of-state voters bused into New Hampshire swayed the election away from Trump and former senator Kelly Ayotte, the Boston Globe reports.

The most recent comments prompted federal election commissioner Ellen L. Weinstraub to fire off a grandstanding public statement about the “extraordinarily serious and specific” clams that demanded Trump “share his evidence with the public and with the appropriate law enforcement authorities so that his allegations may be investigated promptly and thoroughly.”

“The scheme the President of the United States alleges would constitute thousands of felony criminal offenses under New Hampshire law,” Weintraub wrote.

It appears state election data has already accounted for at least nine busloads of folks who broke the law.