More than 600 marches on Saturday drew hundreds of thousands of people across the country, from immigrant-friendly cities like Los Angeles and New York City to conservative Appalachia and Wyoming.
In Washington, D.C., more than 30,000 people gathered in Lafayette Square where shouts of "Shame!" rang through the crowd, according to NBC.
Saturday's rallies are not the first to pop up against Trump's immigration policy, but they are the largest and most organized, with support from civil and social rights groups like the American Civil Liberties Union, MoveOn.org, and the National Domestic Workers Alliance.
Passed down from her Mexican ancestors, the lullaby, she said, was an offering to the children who haven't had a parent to soothe them to sleep since May, when the White House instituted a "no tolerance" policy and began separating immigrant families seeking asylum at the United States border.
"I don't like to live with this fear", she said.
While at the border, Markey plans to deliver hand-made cards, pictures, and messages of support created by children in MA to the children and families being detained.
Attorney General Jeff Sessions in April announced a "zero-tolerance" policy that directed authorities to criminally prosecute adults who were caught at the border.
"I care! Do you?" read Joan Culwell's T-shirt as she joined a boisterous rally in Denver.
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On Monday, Customs and Border Protection commissioner Kevin K. McAleenan temporarily stopped referring families to the Justice Department for criminal prosecution pending an agreement on how parents could be prosecuted without being separated from their children.
More than 2,000 children have been separated from their families as a result of the policy, according to the Department of Homeland Security.
"I hope we send a message to those key policy makers that people care about this stuff, even if it doesn't immediately impact their family, it impacts the standing of this country", Caldera said. The protesters, many donning white T-shirts and clothing, carried signs and gathered in mass outside Dallas city hall.
Since taking office in 2017, Trump has overseen an increase in arrests of people suspected of being in the country illegally.
A 34-year-old protestor in Washington D.C., Jose Flores said that his father entered the U.S. illegally from Guatemala over three decades ago.
The rally Saturday is one of hundreds across the US urging the Trump administration to reunite families. One sign read: "Compassion not cruelty" while another simply said: "Vote".
Counter-protests are expected in downtown Los Angeles and the Northern California city of Grass Valley, though it's unclear if any are scheduled in the Bay Area. "No matter our demographic or political affiliation, we have good qualities as immigrants and refugees".