I wrote about sanctuary cities for Politico today:

It turns out that everything we’ve heard about the evils of states and localities defying federal law is wrong.
So long as a jurisdiction is sticking its thumb in the eye of the federal government on behalf of illegal immigrants who have been arrested and jailed, defiance of federal authority is progressive and commendable.
Over the years, the left has created dozens upon dozens of so-called sanctuary cities devoted to frustrating federal immigration enforcement and doing all they can to make a mockery of our laws. On immigration, they are in effect little islands of secession. Somewhere John C. Calhoun must be smiling — although slightly puzzled — over the renewed prestige of a version of his old, discredited idea of nullification.