There is evidence, although far from certain, that there were hundreds of thousands of votes cast illegally for Hillary, Plus there is Podesta's statement that if a person has a photo ID and claims to be a citizen they should be able to vote, a standard that would allow millions of illegals to vote illegally, and Obama's statement to Gena Rodriqez that there would be no punishment of illegal's voting.
This is presumably the research which was posted and trashed by WaPost linked to by me on Hypothes.is previously