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 U.S.-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, N.J., where the president is spending the weekend.

A rally in Cleveland attracted thousands, and about 2,000 protesters rallied outside the Statehouse in Columbus.

Trump has backed away from family separations amid bipartisan and international uproar. His “zero tolerance” policy led officials to take more than 2,000 children from their parents as they tried to enter the country illegally, many of them fleeing violence, persecution or economic collapse.

Those marching Saturday demanded the government quickly reunite the families that were already divided.

A Brazilian separated from her 10-year-old son a month ago spoke at the Boston rally.

“We came to the United States seeking help, and we never imagined that this could happen. So I beg everyone, please release these children, give my son back to me,” she said through an interpreter, weeping. “Please fight and continue fighting, because we will win.”

The crowd erupted.

In Washington, D.C., an estimated 30,000 marchers gathered in Lafayette Park across from the White House in what was expected to be the largest protest of the day, stretching for hours under a searing sun.

Lin-Manuel Miranda, creator of the musical Hamilton, sang a lullaby dedicated to parents unable to sing to their kids. Singer-songwriter Alicia Keys read a letter written by a woman whose child had been taken.

Thousands waved signs: “I care,” some read, referencing a jacket first lady Melania Trump wore when traveling to visit child migrants. The back of her jacket said, “I really don’t care, do U?” and it became a rallying cry for protesters Saturday.

“I care!! Do you?” read Joan Culwell’s T-shirt as she joined a rally in Denver.

“We care!” marchers shouted outside Dallas City Hall.

“This is the issue crossing the line for a lot of people,” said Robin Jackson, 51, of Los Angeles, who protested with thousands.

Democrats who have clashed with Trump had strong words for the president, including U.S. Rep. Maxine Waters who urged his impeachment.

Trump took to Twitter amid the protests, first to show his support for Immigration and Customs Enforcement as some Democrats called for major changes to the agency. Tweeting Saturday, Trump urged ICE agents to “not worry or lose your spirit” and wrote that “the radical left Dems want you out. Next it will be all police.”

The president later tweeted that he never pushed House Republicans to vote for immigration overhaul measures that failed last week, contradicting a post three days ago in which he urged GOP congressional members to pass them.