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.

It's Trump's birthday and the Army's 250th anniversary parade. Here's what to know, from time to how to watch.

The military parade to mark the Army’s 250th anniversary and its convergence with President Donald Trump’s 79th birthday are combining to create a peacetime outlier in U.S. history.

All those arrested outside the U.S. Capitol will be charged with unlawful demonstration and crossing a police line, authorities said.

On Saturday, for the first time in more than 30 years, the U.S. military is holding a big parade. The event is intended to celebrate the 250th birthday of the Army and to remind Americans of their debt to men and women in uniform.

President Donald Trump on Saturday is set to host a major military parade in Washington, celebrating the Army’s 250th anniversary and Flag Day.

A military parade​ through the streets of Washington, D.C., celebrates the U.S. Army's 250th anniversary on Saturday, June 14. These maps show the route.

Falling on Flag Day and Trump's birthday, the national day of protest is intended to help counter Trump's planned Washington, D.C. military parade.