Is Trump's paramilitary crackdown legal? It's certainly wrong

Federal law enforcement officers advance as demonstrators protest against racial inequality and police violence in Portland, Oregon. — Reuters

IF there really is a law enforcement problem in American cities, why hasn't President Donald Trump sent the FBI to fight crime in Portland, Oregon? Or the DEA to fight violence connected to drug trafficking in Chicago? Why is he sending in special, paramilitary units from the Department of Homeland Security whose job is to enforce immigration laws?

A closer look shows why Trump's use of these officers is so troubling. Federal law enforcement agencies like the FBI and DEA have well defined responsibilities and are institutionally committed to carrying them out, not exceeding them. FBI agents are trained to understand that their job is to investigate federal crimes. DEA agents are trained to know that their job is to investigate federal drug crimes. Agents in both institutions are accustomed to working closely with federal prosecutors.