Texas Gov. Greg Abbott's efforts to bring the border crisis to Democratic mayors' doorsteps has city hall officials across the country huddling about what to do the moment a bus pulls up.
Why it matters: Critics, including Abbott's Democratic challenger Beto O'Rourke, call it a political stunt, but the migrant busing effort will test the values of so-called sanctuary cities as their mayors grapple with social safety-net issues.
