I lived in CA for forty years, often in agricultural areas where many of the Hispanics who are working in the fields are, in fact, undocumented (unlike SoCal where many members of the Hispanic community can trace their families' histories in CA back several centuries). I would be very surprised to find any non-citizens voting. It's just not worth the risk for them; it's all downside with no upside.

Oddly, the only documented case of illegal voting in this election cycle was a Trump supporter voting twice. We also have a Trump advisor who may be illegally registered to vote in two jurisdictions (Bannon) and that case a few years ago involving Ann Coulter.

If there's voter fraud going on, I think we should be looking at a different target than the current occupant of the White House is going to look.