Activists behind the movement say their ranks are swelling by the day with people opposed to the White House's raids and separation of immigrant families.
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Over the weekend, 1,600 people being detained at the border were transferred to federal prisons because current detention infrastructure can no longer house the overwhelming number of detainees.
As questions of children left unaccounted for by immigration authorities mount, rights advocates say the Trump administration's separation of parents and children remains the real issue.