If you're as incensed about this as I am, you can call the Milwaukee County Republican Party HQ at 414-897-7202 and let them know what you think. They're inclusive and open to dialog per their page at https://www.mkegop.com/, so I'm sure they'd love to hear from you.
Have you considered the possibility that the objections here may be more related to an apparent attack on the judicial branch rather than the desire to protect a person residing illegally in the United States?