File - In this Jan. 19, 2007 file photo, Staff Sgt. Kevin Black, 36, of Kenmore, N.Y., of the New York National Guard keeps an eye on a group of suspected illegal immigrants near the Arizona-Mexico ...

A U.S. law dating to the days of Reconstruction following the Civil War is at the center of a controversy over whether President Donald Trump can send active-duty Marines into Los Angeles to help ...

Everything you wanted to know about the law that’s supposed to prevent presidents, like Trump, from deploying the military against civilians in places like LA. California National Guard members during ...

The act is now being used to challenge actions by President Donald J. Trump, who has sent federal troops into U.S. cities, and plans to enlarge the scope of the National Guard with respect to crime in ...

If you’ve been paying attention to President Donald Trump’s vows to deploy active-duty soldiers to police American cities, mainly governed by Democrats, then you’ve probably heard two words pop up ...

June 10 (UPI) --For good or ill reasons, few Americans are aware of the Latin phrase posse comitatus and what it means. President Donald Trump's federalizing the California National Guard and ordering ...

A California judge ruled that President Trump's National Guard deployment to Los Angeles broke federal law under the Posse Comitatus Act. CBS News Mornings dives deeper into the 1878 legislation.

The Posse Comitatus Act is a nearly 150-year-old federal law that limits the U.S. military’s role in enforcing domestic laws. At its core, experts say the law reflects America’s long-standing belief ...

California’s fight to rein in President Trump’s deployment of troops to Los Angeles hinges on a 19th century law with a a blood-soaked origin and a name that seems pulled from a spaghetti western film ...

The trial over President Trump's deployment of thousands of National Guard troops to Los Angeles earlier this summer reached its third and final day Wednesday, as lawyers for the Justice Department ...