Organizers behind the “No Kings” movement said the protests “come in response to President Trump’s escalating use of military force in American cities and a federal agenda that would strip health care from 16 million people while expanding ICE raids targeting immigrants and protestors,” according to a press release.

Millions were expected to gather in “No Kings” demonstrations in over 1,500 cities on Saturday, the same day the Army is celebrating its 250th anniversary on Trump’s birthday.

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.