Unless Rauner wants to put the State of Illinois on suicide watch, he will never go along with Rahm Emmanuel’s Chicago will remain a sanctuary city ultimatum to Trump. Rauner is not nutz, and he still is a Pub, if only nominally one.
There are plenty of Republicans who are probably fully supportive of sanctuary cities/states (I’m surprised that Jeb Bush didn’t turn Florida into a sanctuary state while Governor), but they’re still rational enough to want to keep their jobs. Once Federal funding is cut for one sanctuary city, the rest will fall into line out of desperation.
I live in Wheeling and work in Chicago. I think that Rauner will agree with Emanuel. In 2014, Rauner said that he agreed with the law that allows illegal aliens get driver’s licenses.