Why is it necessary to legalize the roughly 11 million currently-illegal immigrants in the U.S. before newly enhanced border security and internal enforcement measures are in place? Sen. Marco Rubio, the leading Republican on the Senate’s Gang of Eight, says part of the reason is that the federal government can’t afford to secure the border on its own and needs financial help from the immigrants themselves, in the form of fines paid when they are legalized. Rubio made the statement during a radio interview after he voted against an amendment from Republican Sen. Charles Grassley that would have put off...