The Constitution was designed to make local government the most important level of government because the founders knew, if our neighbors were our elected officials and they screwed up, we would have no problem finding them for a bit of a “course correction”. The state government was to be less important than the local government, but more important than the far away federal government. That, in a nut shell, is why our country is in the mess it is; the order of importance of our layers of government are exactly backwards making it difficult to get to and convince those in the far away federal government to be honest brokers for their constituents.
Using that logic whenever we can we should appreciate when the federal government cedes back to the states control over an issue. However, where sanctuary cities are concerned this might not be an issue we want controlled by the states-especially if those states are run by politicians who wish to undermine our rule of law by providing greater protections for the illegal immigrants than they do their legal citizens.
To learn how the Trump Administration is attempting to put certain sanctuary cities on notice click on this link.