PHILADELPHIA (AP) — Cities large and small were preparing for major demonstrations Saturday across the U.S. against President Donald Trump, as officials urge calm, National Guard troops mobilize and Trump attends a military parade in Washington to mark the Army’s 250th anniversary.

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.

Saturday protests across the nation coincide with a military parade planned by Trump on his birthday and the 250th anniversary of the Army.

Thousands of Coloradans are expected to turn out on Saturday to stage protests against recent immigration crackdowns and executive orders from the Trump administration that have led to violent

Protests against the Trump administration, which are set to continue this weekend after a week of uprising that spread from Los Angeles across the country, have energized a portion of the left-wing base that has been despondent since President Trump’s election.

The organizers of this weekend's upcoming "No Kings" protests have issued a video reminding people about the event. The video, released on the No Kings website, reminds those planning to attend of details and calls on people to join the protests.

Saturday tens of thousands are expected to turn out in Philadelphia, which is holding the so-called flagship No Kings demonstration against Donald Trump administration policies.