Brennan Center for Justice: The Myth of Voter Fraud.
Politicians at all levels of government have repeatedly, and falsely, claimed the 2016, 2018, and 2020 elections were marred by large numbers of people voting illegally. However, extensive research reveals that fraud is very rare, voter impersonation is virtually nonexistent, and many instances of alleged fraud are, in fact, mistakes by voters or administrators. The same is true for mail ballots, which are secure and essential to holding a safe election amid the coronavirus pandemic.
Noncitizens are not permitted to vote in state and federal elections. It’s a federal crime for noncitizens to register or vote in federal elections, and it’s a crime under every state’s laws. So it should come as no surprise that every legitimate study ever done on the question shows that voting by noncitizens in state and federal elections is vanishingly rare.