The bill offers a potential pathway to citizenship to many young immigrants who arrived in the United States illegally as children but also provides money for Trump's proposed border wall with Mexico.
The Obama administration did something similar in 2014, sending 7,000 so-called "unaccompanied alien children" on three military bases.
It's also unclear what will happen to the children already separated.
Pratheepan Gulasekaram, an immigration law professor at Santa Clara University, said the Los Angeles federal court with jurisdiction over the Flores settlement is unlikely to grant the government's request to modify it.
Rep. Pete KingPeter (Pete) Thomas KingGrimm condemns Donovan after Trump endorsement: Endorsements can't change facts Trump backs Donovan in New York House race The Memo: "Roseanne" storm revives debate over Trump MORE (R-N.Y.) on Thursday said he does not believe Republicans inability to pass immigration reform will hurt the party in the midterms.
In an eleventh-hour effort to round up votes, Ryan took two dozen wavering lawmakers to the White House Wednesday so Trump could cajole them into supporting the bill.
"Our members wanted to express themselves on an issue they care a great deal about", Speaker Paul Ryan said. The AP cited two people with knowledge of the situation, but who only spoke under the condition that they would remain anonymous.
One of the people said Nielsen, who had become the face of the administrations policy, had little faith that Congress would act to fix the separation issue and felt compelled to act. She was heckled at a restaurant Tuesday evening and has faced protesters at her home.
"What is the objective of the House doing good immigration bills when you need 9 votes by Democrats in the Senate, and the Dems are only looking to Obstruct", Trump said in a tweet on Thursday as he renewed his call for a change in Senate rules to allow legislation to move with a simple majority.
He had tried to blame Democrats for the separations policy and force them into concessions, including funding for a wall he wants to build along the border with Mexico. "Republicans want security. But I am working on something - it never ends!"
On Wednesday (Thursday NZT), Trump reversed himself and took executive action aimed at curbing the separation of families.
Family separation has seen a recent uptick due to Attorney General Jeff Sessions' "zero-tolerance" policy for illegal entry at the U.S. -Mexico border.
One official said it was the Justice Department that generated the legal strategy that is codified in the executive order, and disputed the notion that Homeland Security was involved in drawing up the document.
The Flores settlement, named for a teenage girl who brought the case in the 1980s, requires the government to release children from custody and to their parents, adult relatives or other caretakers, in order of preference. If those options are exhausted, authorities must find the "least restrictive" setting for a child who arrived without parents.
But that has not satisfied Democratic lawmakers and immigrant advocates, who have called on the Trump Administration to reunite families as quickly as possible.
The action came after a firestorm of protest from administration opponents and allies, reacting to pictures and sounds of young children traumatized by their separation from their parents at the hands of USA authorities.
The House bills would undo a federal court agreement that limits the time that minors here illegally can be held in custody to 20 days, which would allow them to be with their parents in a detention facility indefinitely.
The agency's network of immigration jails for single adults is much larger, because ICE leases detention facilities and vacant cells from states and counties across the country.