Did 3 million people vote illegally in the 2016 election? There’s no evidence that’s true, but President Trump certainly believes so, making news his first week in the White House by ordering an investigation into that allegation. Even if only partly substantiated, it would probably be the single largest instance of voter fraud in American history. The source for Trump’s convictions seems to be a Twitter account run by Texan businessman and former public official Gregg Phillips, the founder of VoteStand, a mobile app designed to allow users to report incidents of voter fraud. Using data from conservative nonprofit True the Vote, Phillips claimed that he identified millions of illegal votes. Those claims went viral when published, were amplified by the conspiracy-theory website InfoWars, and ultimately reached the president himself. But those data have not yet been released, and questions about the credibility of their purveyor and his methods and claims abound. Even Phillips himself is now backing off the original 3 million number that sparked the president’s demand for an investigation, explaining that he needs more time before he’s willing to provide final numbers or release his raw data. “Over a hundred million people voted. Impacting a presidential election is probably less likely than impacting anything down-ballot,” Phillips said. “I’m not gonna be goaded into going faster than I want to. I’m not a government official, I don’t have protections, and if I accuse somebody of voter fraud, we have to be sure that what we’re saying is right. While I believe I’m right, it’s in my best interest and everybody else’s best interest to make sure this is right.”