They crossed through Mexico to reach the US border.
CBS News learned children under five years old are allowed to stay with their parents in most cases. Wouldn't that be awesome? "We don't have a balanced view of what's happening, but what's happening at the border is the border is being overrun by those who have no right to cross it". Shouting and partisan posturing on both sides don't help, either.
Until Wednesday, the president, Homeland Security Secretary Kirstjen Nielsen and other officials had repeatedly argued the only way to end the practice was for Congress to pass new legislation, while Democrats said Trump could do it with his signature alone. "They remain in the country even though they don't have a lawful process to be here and enormous cost that is being incurred by our government".
Since the policy was announced in April, more than 2,300 children have been separated from their parents at the USA border, according to reports. The audio includes the sounds of a chorus of children sobbing and asking for their parents, some in what sounds like significant levels of distress. Photos and videos released over the weekend showed children being held in metal cages in processing facilities.
Hours after her tweets, Nielsen was singing a different tune in a speech at the National Sheriff's Association annual conference in New Orleans. After the adults went to court for their hearings, where they typically plead guilty, they have returned to their holding facilities to find that their children were no longer there.
Anastasia Tonello, president of the American Immigration Lawyers Association said the detention of families - parents and children - who pose no flight risk or danger to the community is simply "unacceptable, abrogates global responsibilities to refugees, and goes against our country's most fundamental values".
Fine, but what is the policy?
Former Democratic presidential nominee Hillary Clinton said Mr Trump's widely debunked claims that the family separations were mandated by law was "an outright lie". That should not come as a surprise.
This social science research on the harms of family separation is backed up by biological research on its physiologic impact.
Their policy is that if you cross the border illegally, you will be prosecuted.
In order to prevent family separation, families will be detained together "where appropriate and consistent with law and available resources".
In May, the Department of Justice adopted the zero-tolerance policy in which anyone caught entering the USA illegally is criminally prosecuted.
For their parents. Exactly as Neilsen masterfully didn't exactly say. "There must be a better solution than a simple choice between "catch and release" and separating children from their parents".
"I live in a border state".
But because Customs and Border Protection must refer cases to Justice for prosecution, the decision to stop referring parents effectively neuters the zero tolerance policy.
Bush characterized "warehousing children in box stores" and plans for tent cities outside El Paso as "eerily reminiscent of the internment camps for US citizens and noncitizens of Japanese descent during World War II, now considered to have been one of the most shameful episodes in USA history". Like Mrs. Bush, many summed up their view of the issue quite neatly.
If the parent is being deported, ICE said it will work with ORR to reunite them with their child at the time of deportation and with the consulate representing their country to assist the parent with obtaining a travel document for the child. "It is the parents that are putting them through this", wrote someone using the pseudonym john_q_taxpayer.
Fortunately, the presence of sensitive and responsive caregivers (generally parents) seems to protect toddlers from some of these harmful hormonal fluctuations.