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.

The Army pulled off a sweeping affair featuring more than 6,000 soldiers, 50 aircraft, and fireworks to cap the event highlighting its 250th anniversary.

Millions of demonstrators mobilized around the country as a smaller, subdued crowd gathered to witness the display of grandeur and might in the nation’s muggy capital.