If they are criminals, this is certainly true.
Sanctuary city Mayors take note
You are not above the law:
8 U.S. Code § 1227 - Deportable aliens
The most common conviction-based grounds of deportation are the following:
Aggravated felony convictions (some 35 different offenses and categories of offenses listed at INA § 101(a)(43).Controlled substances convictions.Firearms convictions.Convictions of crimes of moral turpitude.Domestic violence convictions.
Would be horrible if this urban myth spread widely and they all fled back to where they came from ILLEGALLY.