The No Kings Day of Defiance is expected to be the largest single-day mobilization since President Trump returned to office.

PHILADELPHIA (AP) — Cities large and small were preparing for major demonstrations Saturday across the U.S. against President Donald Trump, as officials urge calm, National Guard troops mobilize and Trump attends a military parade in Washington to mark the Army’s 250th anniversary.

A flagship "No Kings" march and rally are planned in Philadelphia, but no events are scheduled to take place in Washington, D.C., where the military parade will take place on Trump's 79th birthday. Organizers of the protests say they want to take attention away from the parade.

On June 14, traditionally Flag Day, protestors plan to gather for a “nationwide day of defiance," according to their website.

From protests to parades to the president's birthday, this weekend's itinerary is packed. Here's what to know about 'No Kings' protests in Florida

Social media chatter escalates as white nationalist ​organizations capitalize on Saturday’s planned demonstrations against Trump policies.

Follow live updates as the military parade in Washington, D.C., kicks off on Trump's birthday. 'No Kings' protests by opponents are planned across the country today.