When you let in anyone who wants to be here, for any reason, you have no borders.
But that's not a surrender of the border, and anyone who comes in has to go through the immigration process, as flawed as it might be.
Still, how is that "surrendering the borders"? Seems like a vague, deliberately ambiguous statement that allows maximum parameter shifting later on in the debate. So I expect you to start walking that back now, one piece at a time.