Trump’s main source for his claims is an old Pew report, whose authors have repeatedly said that it does not support Trump’s claim at all. That report doesn’t even look at voter fraud, but rather at America’s lackluster technology for registering voters.
More broadly, respected research on voter fraud has found again and again that it’s extremely rare in the US. At most, there might be a few hundred fraudulent votes in national elections — in which well over 100 million people can vote.
“The claim that there were millions of illegal voters in this past election is false and unsupported by any credible evidence,” Rick Hasen, a professor of law and political science at the University of California Irvine, wrote. “The National Association of Secretaries of State, made up of the chief election officers of all 50 states, just issued a statement saying so.”
https://www.vox.com/policy-and-polit...aud-commission
No, there is no evidence that thousands of noncitizens are illegally voting and swinging elections - LA Times