Take the story as it is (mis)construed and run with it. Let the left debunk it as fake news. You can even try one of the standard rejoinders ie "conspiracy theory" to deflect & refute. Example:
Subject: Illegal accused of rape released. Leftist: That's fake news. You: Nice, advancing your pet conspiracy theory again.
See how this works? Don't give them an even break; they certainly don't/won't given the same opportunity.
There are plenty of real examples of sanctuary cities refusing to cooperate with ICE. This was not one of them. This is a fake story.
If we are going to make up stories, then we are no better than the Rats.