It seems to me that one cannot support the current rhetoric concerning illegals and oppose chipping them without contradiction.
Now if you were to say that merely crossing the border was not a criminally punishable crime, then you might have am argument. But chipping people is arguably more humane than familial separation, imprisonment, deprivation of food, medical treatment and coercion. It would cost less, it would serve as a deterrent, it would assist with repeated violators, it would make locating individuals in hostile terrain easier (so it could save lives), and it qould disincentivize repeated use of drug mules once they were captured once.