How do we as Americans maintain a stance that illegal aliens are not welcome here?

I am so glad Trump is aggressively enforcing this now. Let's get all these Haitians, Guatamalans, Hondurans, and Mexicans out of here! They have flooded my hometown recently and they need to leave!

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I thought about helping with this process, either administratively or even joining an approved militia to remove these bastards.
How do we as Americans maintain a stance that illegal aliens are not welcome here?
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