Why do many people assume that immigration is a right than a privilege?

Right now, there is so much uproar about Trump detaining and deporting illegal immigrants and legal immigrants who overstayed their welcome by doing things such as engaging in disruptive protests on college campuses. Why is this? Isn’t immigration a privilege rather than a right? Can’t the USA kick out intruders or those who overstay their welcome just like private property owners can?

Why do many people assume that immigration is a right than a privilege?
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