Mark Murray for NBC News:

When the fact-checking group PolitiFact looked into Phillips’ claims, it said his inability to release the proof made his findings suspect. “Phillips will not provide any evidence to support his claim, which happens to be undermined by publicly available information. If Phillips does release a more detailed report, we will consider that information. But for now, this claim is inaccurate. We rate it False.”…

Richard Hasen, an election-law expert at the University of California-Irvine School of Law, doesn’t buy Phillips’ allegations. “He’s offered nothing credible whatsoever. It is his word, with absolutely no evidence so far.”

Hasen adds that there have been cases of voter fraud in the past, but never on this massive scale. “Of course voter fraud exists. It is a real, but very small, problem, and the rate of impersonation fraud is minuscule. The rate of noncitizen voting is quite small as well, though there are some documented cases.”

In an interview with NBC News, Phillips said he didn’t care about complaints like Hasen’s that he has offered no public evidence. “I don’t care. I’m just an average citizen who has access to a big database … and an understanding of what I’ve got,” he said, adding that he’s taking his time to make the information public because he doesn’t want to wrongly accuse anyone of voting illegally.