"To establish an uniform Rule of Naturalization"
"To provide for the common Defence"
“define and punish . . . Offences against the Law of Nations" -- At the time the Constitution was written, immigration and emigration restrictions were a well-recognized branch of the so-called "Law of Nations", and illegal immigration is an offense against the law of nations. If you need a primer on what the Law of Nations is, I can give you one. Suffice it to say that the Founders were aware of what this phrase meant.
And he ignores it cause he’s skeered.