Fire the bad cops....problem solved
Firing a Few Cops Won't Fix Chicago:
1. Chicago has long been KNOWN as being one of the most corrupt cities in the country.
2. The whole state of Illinois has long been known as one of the most politically corrupt states in the union.
3. There have been many instances, in other cities, of crime and corruption coming straight from the Mayor's office... which is likely the case in Chicago.
Conclusion:
Firing a few bad cops won't fix a place like Chicago.
Notes:
1. Trump did not mention the military, which would be a huge legal and ethical problem. He just said "Feds", which usually refers to law enforcement.
2. This tweet might not have been about crime at all; since Chicago is Obama's home town, and is a bastion of Obama and Hillary cronies (including Rahm Emanual, the mayor) ... it may just have been a "shot across the bow" to the corrupt political establishment.