Updated at 6:55 p.m. ET
They began Saturday as a series of pop-up demonstrations outside several major airports. But by Sunday, the protests against President Trump's temporary immigration freeze had leapt from those airports to squares and plazas in cities across the U.S.
Outside the White House, in Boston's Copley Square and Battery Park in New York City, immigrant advocacy groups have organized protests to register their discontent with the executive order Trump signed Friday.