Lin-Manuel Miranda sings lullaby for migrant children separated from their parents

Lin-Manuel Miranda, the creator of hit Broadway musical "Hamilton," broke out into song on Saturday during a protest in the nation's capital, dedicating his lullaby to migrant parents who have been separated from their children.

"We’re here because there’s parents right now who can’t sing lullabies to their kids," Miranda said. "And, well, I’m just going to sing a lullaby that I wrote. And this is for those parents, and we’re not going to stop until they can sing them to their kids again."

Miranda was among several high-profile speakers at the "Families Belong Together" march in Washington's Lafayette Square, just across from the White House. Tens of thousands of protesters flooded the capital to protest President TrumpDonald John TrumpTrumps light 97th annual National Christmas Tree Trump to hold campaign rally in Michigan 'Don't mess with Mama': Pelosi's daughter tweets support following press conference comments MORE's immigration policies and the president himself.

The march was one among hundreds taking place across the country on Saturday to demonstrate against the Trump administration's "zero tolerance" immigration policy that seeks to prosecute people who cross into the U.S. illegally via the southern border.

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That policy has led to the separation of thousands of migrant children from their parents at the U.S.–Mexico border and sparked weeks of public outrage nationwide. 

Trump, bowing to public pressure last week, signed an executive order allowing children to be detained with their parents. But the details of how the government plans to enforce that order remain murky, due to a 1997 consent decree barring the detention of minors for more than 20 days.

A federal judge in San Diego this week ordered the government to quickly reunite children with their parents, giving officials 14 days to reunite children under the age of 5 and 30 days for those older than 5.

It's not yet clear how the government will meet that deadline.