Leading up to the military parade in Washington, D.C. Saturday, as many as 2,000 cities erupted in a coordinated, nationwide protest.

Coinciding with Trump's 79th birthday, the parade will feature tanks, bands and thousands of troops in honor of the Army’s 250th anniversary celebration.

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.

While many demonstrations against the Immigration and Customs Enforcement agency have been peaceful, with marchers chanting slogans and carrying signs, others have led to clashes with police who have sometimes used chemical irritants to disperse crowds. Hundreds have been arrested.