WASHINGTON — They wore white. They shook their fists in the air. They carried signs reading: "No more children in cages," and "What's next? Concentration Camps?"In major cities and tiny towns, hundreds of thousands of marchers gathered Saturday across America, moved by accounts of children separated from their parents at the US-Mexico border, in the latest act of mass resistance against President Donald Trump's immigration policies.

Protesters flooded more than 700 marches, from immigrant-friendly cities like New York and Los Angeles to conservative Appalachia and Wyoming. They gathered on the front lawn of a Border Patrol station in McAllen, Texas, near a detention center where migrant children were being held in cages, and on a street corner near Trump's golf resort at Bedminster, New Jersey, where the president is spending the weekend.

"Do you know where our children are?" one protester's sign there asked. Another offered: "Even the Trump family belongs together."Trump has backed away from the family separation policy amid bipartisan and international uproar, and those marching Saturday demanded the government quickly reunite the families that were already divided.