President-elect Donald Trump said that he plans to somehow declare a national emergency and enlist the help of the U.S. military to deport millions of undocumented immigrants.

And as if on cue, Trump¡¯s handpicked ¡°border czar,¡± Tom Homan, has ramped up his attacks on the many Democrats who lead America¡¯s deep-blue cities and have promised to do whatever they can to protect their residents. ¡°You¡¯re not going to stop us,¡± Homan fumed on Fox News. ¡°But let me give you a word of advice: If you impede us, there¡¯s going to be consequences.¡±

So far, the mayors and governors of these sanctuary cities and states have remained largely undeterred, even defiant in the face of such threats, just like they were during Trump¡¯s first term eight years ago. ¡°Come at me, bro¡± seems to be their prevailing mood. But how long can that last?