As a military parade rolls through Washington, DC, on Saturday – President Donald Trump’s birthday – millions of Americans are expected to protest in what organizers predict will be the strongest display of opposition to Trump’s administration since he took office in January.

Demonstrators crowded into parks and plazas across the U.S. Saturday to rally against President Donald Trump as officials urged calm and mobilized National Guard troops ahead a military parade to mark the Army’s 250th anniversary that coincides with the president’s birthday.

Protesters will converge nationwide for "No Kings" protests. But what are they? Why protest on Trump's birthday and military parade? What to know.

The "No Kings" protest and march happening in Philadelphia on Saturday coincides with hundreds of rallies scheduled to take place across the country.

Protesters filled the streets of cities all over the country to voice their opposition to the Trump administration as the president oversaw a parade to commemorate the 250th birthday of the U.S. Army in Washington,

McCormick was one of the thousands of people who participated in a “No Kings” protest at Old College Hall in Newark on June 14 to make a difference.

The U.S. Army celebrated its 250th anniversary on Saturday with a massive military parade in Washington, D.C., against a backdrop of political division and protests savaging President Trump.

People in 2,000 locations across the country gathered for 'No Kings Day' to protest the military parade being held on Donald Trump’s birthday.

A lot is planned for this Flag Day, from 'No Kings Day' protests of President Donald Trump's policies to a papal speech to a military parade in Washington.

The rallies come on the same day as a military parade in Washington D.C. honoring the U.S. Army's 250th birthday and President Donald Trump's 79th birthday.