The public sentiment in those cities regarding immigration has completely flipped from the moment the buses started arriving. They were loudly in favor of refusing to enforce immigration laws when El Paso, Texas was dealing with hundreds of thousands of illegal border crossings over decades, but the second a few thousand start showing up in buses in Chicago and New York City, they declare a state of emergency and start demanding the stop of the immigrants being transported to their cities because they have no room. And now it’s probably the single strongest issue the Republicans are going to win on in the election.

I’m not conservative, but sending illegal migrants directly to sanctuary cities might be the single most effective strategic political move in my lifetime. It flipped a decades old stalemate on its head practically overnight.

Sure, in the beginning but it also proved the Republican point that you can't handle an unrestricted amount of immigration, even in large cities which also goes in favour of immigration restrictions (and of course not total immigration blockage which is not feasible and silly).