Open Borders....to the yes people it means uncontrolled Immigration - to the no people it means uncontrolled Invasion. Seems clear to me that both are correct.
I think "open borders" means no constraints whatsoever on immigration, legal and illegal, altho' for an open borders purist there would be no reason to use the words "legal" or "illegal".
Being pro-amnesty is deluding oneself into believing the constraints on *illegal* immigration can be relaxed "temporarily" with little or no negative consequences.