The president signed an order earlier this week to send Tennessee state National Guard troops, along with officials from various federal departments and agencies, into Memphis, in an effort to fight crime. It's one of several U.S. cities Trump has singled out for such a move, testing the limits of presidential power and military force.

A federal judge's mild ruling in the Justice Department's suit over Google's search engine monopoly has critics worried that the tech giant can now monopolize artificial intelligence.