Illegals could have easily made up the difference. Especially in CA.
And remind them that Democrats fight every attempt to add integrity to the electoral process.
And if they think that illegals should vote then ask them if we should make up the laws as we go?
You might also posit something like this - "If we went by popular vote, suppose it ended up that one candidate led the other by a mere 100,000. If you think Florida 2000 Bush/Gore was a zoo, what do you think that one would be like?"