I think he's referring to illegal aliens voting illegally (which does happen sometimes) or, once they become legal through whatever means, they will become reliable Democrats. Or, their children will do the same. One way or the other, replacement-Americans tend to support the left. Always have. It's proveable.

Also, these sorts of shenanigans:

https://www.npr.org/2021/12/15/1064385999/new-york-city-will...