Fund calls the idea of a secure border "Pat Buchanan's idea of a reverse Berlin Wall," which is a really strange way of talking about Homeland Security; the Berlin Wall was supposed to keep people in, who had a right to leave.
A wall on the southern border would be keeping people out, who have no right to enter.
Fund also takes a shot at Michael Bloomberg for being a "scofflaw" in refusing to cooperate with the immigration authorities. Fund is apparently unaware that "scofflaw" is the official position of the WSJ editorial board. See Tamar Jacoby's remarks here.