"I care!! Do you?" read Joan Culwell's T-shirt as she joined a boisterous rally in Denver.

"We care!" marchers shouted outside Dallas City Hall. Organizer Michelle Wentz says opposition to the Trump administration's "barbaric and inhumane" policy has seemed to cross political party lines. The "zero tolerance policy" of prosecuting people caught entering the country illegally led officials to separate more than 2,000 children from their parents before being abandoned.

Trump took to Twitter to show his support for Immigration and Customs Enforcement amid calls from some Democrats for major changes to the agency. Tweeting from New Jersey on Saturday, Trump urged ICE agents to "not worry or lose your spirit." He wrote that "the radical left Dems want you out. Next it will be all police."Though many at the rallies were seasoned anti-Trump demonstrators, others were new to activism, including parents who said they felt compelled to act after heart-wrenching accounts of families torn apart.