Protesters clash with supporters of Trump's military parade in Washington, D.C., as they disagree over the president's authoritarian intentions.

Americans are demonstrating against President Donald Trump across the U.S. as counterpoint to the 200,000 people expected to attend the military parade in Washington.

A 33-mile trip from one protest in Annapolis, Md., to the parade grandstand in front of the White House was like a journey between two different countries.

The parade was the spectacle event Trump had long wanted. It also helped sparked the largest mass opposition to him since his inauguration 145 days earlier.

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.

U.S. Capitol Police arrested about 60 demonstrators Friday evening during a protest of the appearance of troops in Saturday’s Army celebration in Washington and at immigration protests in Los Angeles. More than 50 of those arrested were veterans, according to organizers.

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.