Previous administrations, Republican or Democrat, did not dismantle DHS or ICE since its post-9/11 establishment, so now we have this runaway train with hi-tech Israeli spyware. Using this new device won't require a warrant.
By size, and having no need of obtain warrants for surveillance or detentions, ICE has become more powerful than the FBI.
The FBI must obtain judicial warrants for arrests, wiretaps, or searches from a federal magistrate.
ICE may have to obtain a search warrant for a US citizen's private property, so to avoid that Constitutional paperwork, they will just deploy around businesses, schools, traffic intersections, Home Depots, courthouses, airports, or any public spaces.
Anybody ICE detains does not have to be taken before a federal magistrate, unlike the FBI or DEA, like we saw with Nicolas Maduro.
If the detainee is a US citizen, they must prove it at the ICE facility in order to be released.
