The rally is one of more than 600 marches planned across the country protesting the Trump administration's "zero tolerance" policy that separates children from their parents at the U.S. -Mexico border.
The main rally is taking place in Lafayette Square in Washington, but hundreds of marches, protests and rallies were underway across the country to call for the immediate reunification of migrant families and an end to family detentions and separations. "Concentration camps?" Some in Denver donned foil blankets like the ones given to children in Texas detention centers.
"Separating families, especially young children, without a plan to reunite them is abhorrent", Stokes said.
"A federal judge ruled against Trump's family separation policy - but we know the administration will fight back", the statement said.
Democratic senators Mazie Hirono, Tammy Duckworth, Kirsten Gillibrand and Jeff Merkley, who have been critical of Trump's immigration policies, spoke with some of the protesters.
"We don't believe in borders, we don't believe in walls", Sebastian Medina-Tayac, of the Piscataway Indian Nation, declared in English and Spanish at the start of the rally dubbed "Families Belong Together".
Trump says illegal immigration fosters crime and he implemented a "zero tolerance" policy in May to prosecute all immigrants apprehended for entering illegally.
"Ultimately the (San Diego) case leaves it up to parents to decide what is in the best interests of the child", Gelernt said. Michelle Wentz, an organizer of the rally there, said opposition to the administration's "barbaric and inhumane" policy has seemed to cross political party lines.
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Critics say the agency has treated some would-be immigrants cruelly and unfairly.
"What's happening is really appalling", said Notario, who identified herself as a mother and a Cuban immigrant who has lived in the United States for 23 years.
After some speeches, the counter-protesters, including a man towing the "Trump Unity Bridge" halted traffic on East Michigan Avenue, leading to more chants and confrontation from protesters.
Tyler Houlton, a spokesman for the U.S. Department of Homeland Security, welcomed interest in the immigration system and said only Congress has the power to change the law. They carried signs with slogans like "We are all immigrants" as they chanted "Love, not hate, makes America great".
"I have watched ICE liberate towns from the grasp of [criminal gangs]", Trump said on Twitter.
More than 630 events were planned calling for migrant families split up at the U.S. border to be reunited.
Marchers gathered in Raleigh, in Pittsburgh, in Louisville, in Houston, in Antler, North Dakota, population 27.