The conflicts over President Donald Trump’s deployment of National Guard troops to Illinois and Oregon hinge on a question as old as the Constitution itself: Where does federal power end and state authority begin?

During a hearing on Friday, lawyers told a judge that National Guard troops sent from Republican-led states had been conducting conduct law enforcement work.

As court rulings shift “hour by hour,” experts say city officials must build a united front with law enforcement, businesses and communities — before troops arrive.

Experts say immigration agents have more latitude to be destructive than National Guard—with fewer avenues for San Francisco to push back.

Illinois and Chicago have sued the Trump administration to block deployment of the National Guard to Chicago, though it was revealed in court that troops are already on the way.

A three-judge panel appeared skeptical of the Trump administration’s arguments that the president has judicially un-reviewable power when it comes to the deployment of the National Guard on the streets of Los Angeles.

The new bill in New York would allow the state attorney general to sue for a court order blocking a guard deployment if another state attempted to send troops without authorization. That wouldn’t include cases where the guard has been formally federalized, according to News 10.

A D.C. man filed a lawsuit stating that 'The Imperial March' is used in his peaceful protests against U.S. President Donald Trump's deployment of National Guard members.