In a city known as the cradle of American democracy, an impassioned, hourslong protest filled the streets for a ‘No Kings Nationwide Day of Defiance.’

Philadelphia will be the site of a “flagship protest” in a nationwide movement opposing President Donald Trump’s Administration on the same day as a major military parade in Washington. The demonstration is expected to disrupt traffic throughout the day.

Organizers of the “No Kings” demonstrations said millions had marched in hundreds of events. In Oregon, tens of thousands of people gathered in downtown Portland for two large protests -- one that began in Tom McCall Waterfront Park and the other at the Oregon Convention Center.

Protests are scheduled in Bucks County and nationwide on June 14, with the largest turnout expected in Philadelphia. Here's what to know if you go.

An 81-year-old man in Philadelphia decided to leave his senior citizen home and march in the "No Kings" protests occurring across the country against the Trump administration's immigration policies. NBC News' Erin McLaughlin reports.

The largest "No Kings" protest on June 14 is expected to take place in Philadelphia as a nod to the country's history and to avoid accusations that protesters are opposing the Army parade in the nation's capital, organizers have said.