The figure includes more than 1,500 migrant children that were not previously disclosed by the Justice Department.
The Fortune Most Powerful Women Summit hosted a session with Nielsen, despite heavy pressure from activists to rescind the invitation.
The demonstrators were protesting Microsoft's business ties with U.S. Immigration and Customs Enforcement.
The actor, who's in the television show "The Terror: Infamy," condemned the Trump administration's family separations along the southern U.S. border.
After being split from their parents, some children were allegedly sexually, physically or emotionally abused in foster care.
Official calls it "textbook." Critics say ICE forgot about the kids — again.
"Don't leave the children with cryingness," sobs devastated 11-year-old Magdalena Gomez Grigorio.
The government was asked to curtail the practice happening at the U.S.-Mexico border last year.
About 70 activists prayed the rosary as they rallied at Capitol Hill to protest the government’s treatment of children at the U.S.-Mexico border.
The child was reportedly scolded by a Border Patrol agent for crying when her father, who she didn't pick, was taken away.
Ken Cuccinelli was pressed by CNN host Jake Tapper but refused to offer any assurance that families would avoid separation during Sunday's raids.
In addition, more than 25 kids were separated from their parents for more than a year.
The "Star Trek" actor told GQ about how his experience in concentration camps for Japanese Americans during World War II compares to migrant detention today.
Julián Castro is facing backlash from some other Obama administration alums over his calls to repeal the law Trump has used to split up families at the border.
The American Academy of Pediatrics released haunting images drawn by children who had been in Customs and Border Protection custody.
Kids told lawyers they're sick, cold, wake up hungry in the middle of the night, sleep on cement floors, and take care of babies separated from their families.
An official, who briefed reporters on the condition of anonymity, wouldn't say exactly how many children are currently detained there.
"How many toothbrushes, soap and blankets can you buy if you sell a pair of Louboutins? Be Best!"
"I can't imagine my own child being there and not being broken," said Dr. Dolly Lucio Sevier.
Days earlier, a Justice Department lawyer argued that the government didn't need to provide toothbrushes, soap or beds to detained migrant kids.