I'm not a Democrat, but I can tell what they would say to a bill that would "seal the border". They would say, "Why are you such a raaaaaacist? Why do you want to separate families? Veto sustained. Next?"
“Why are you such a raaaaaacist? Why do you want to separate families? Veto sustained. Next?”
Go ahead and say that. And hold it over their heads for two years.