Sessions and the administration altered how it would prosecute immigrants who illegally crossed the southern border rather than going through a regulated port of entry.
Trump, an avid viewer of cable television news, recognised that the family separation issue was a growing political problem, White House sources said.
Homeland Security Secretary Nielsen briefed lawmakers on Capitol Hill Wednesday, and those on the fence over pending immigration legislation headed to the White House to meet with Trump.
It is unconscionable, unconscionable, that the government of the United States is warehousing babies and toddlers, alone, in an institutional setting, he said.
Trump threatens tariff on all European cars
China says will hit back if the latest tariff threats from Trump materialize, while India slaps retaliatory levies on U.S. goods. India and Turkey have already targeted United States products, ranging from rice to autos to sunscreen.
The California Democrat asked the U.N.to investigate operations under the authority of the Department of Homeland Security and the Office of Refugee Resettlement at the border and "throughout the more than 17 states around the country that are now housing children who have been separated from their families".
He said he was looking into whether the court could block deportation of parents until they have been reunited with their children, and whether it could force the Trump administration to reunite those separated.
The crisis has reached the point that the usually silent first lady Melania Trump and former first lady Laura Bush have joined the public pushback.
Since 5 May, 2,300 children have been separated from their families at the border in Mexico.
In a lengthy Facebook post, he took a thinly-veiled shot at President Donald Trump's "zero-tolerance" immigration policy that has left bereft and panicked children in facilities away from their parents at the border.
A Supreme Court Ruling Could Make Your Online Purchases More Expensive
South Dakota was backed by 35 states in the case, each of which filed an amicus brief in support of online sales tax. Before this ruling, Amazon , for example, collected sales tax only from customers in Washington and Pennsylvania .
Trump said he faced a dilemma between what he considered weak border-enforcement policies that allowed too many undocumented immigrants into the country, but he said stricter border enforcement stirred accusations that "you don't have any heart", then added "perhaps I'd rather be strong".
This is counter to what the Trump administration and the president himself has argued, claiming the president's hands were tied and that Congress only had the power to stop the separation of families. "But because of a 1997 order and related decisions, children can not be detained for longer than 20 days with the adults", writes Fox News.
Trump's decision to relent was a reversal since he had gambled that he could use the plight of the children and public outrage to ram through his hardline changes to immigration police in legislation. Children can't be jailed with their parents.
"We are working on a much more comprehensive bill", Trump said.
Now, with the number of families detained rising during Trump's current immigration crackdown, questions were immediately raised about whether children will be released into foster or other care at the end of 20 days if their parents' immigration proceedings have not wrapped up.
Captain Kane comes good to heighten England's aura of optimism
If they didn't think it's a penalty, we have to deal with that. "Hopefully I am OK", he said after the game. I tried to run at a few corners and just couldn't move.