Article IV, Section 4, of the United States Constitution tasks the federal government with protecting the States from invasion.
An invasion is defined by the American Heritage College Dictionary, in its third definition presented, as "An intrusion or encroachment." The American College Encyclopedic Dictionary's second, third, and fourth definitions define invasion as being: "The entrance or advent of anything troublesome or harmful, as disease; entrance as if to take possession or overrun; infringement by intrusion." Based on those definitions, I think it is safe to call illegal immigration an "invasion."
If illegal immigration is an invasion, and Article IV., Section 4 of the Constitution tasks the federal government with protecting the States from invasion, then in line with Article I,
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