Here's you a link for Chinese at the Southern border:
The number of Chinese migrants illegally crossing into the US during the last three months of 2022 skyrocketed by over 700% compared to the same period a year earlier, data shows.
nypost.com
Note: 700% says nothing about actual numbers. If the initial number is tiny, a small increase in numbers can cause a whopping increase in percentage. The point is that yes, it's happening.
Nor does the link say anything about party membership. Will note the following: Party affiliation is not a requirement in voting in anything but primaries, and in some states that's not a factor, either. There is nothing against the law for someone with duel citizenship who is also a CCP member to vote in a US election.