But what impact will that have at the border?
The order is "a restatement of the current policy to prosecute, detain and deport Central American asylum seekers", said Kerri Talbot, legislative director of The Immigration Hub, a national organization that supports immigrant and refugees organizations.
It's absurd to turn around and fight Flores when the problem is the draconian policy that requires mass housing, feeding and care of immigrant families.
It proposed that all immigrants apprehended should be criminally prosecuted under the country's criminal entry statute.
'Get it done, always keeping in mind that we must have strong border security'. "Children, especially those fleeing persecution, need safety and environments where they can thrive and play and be safe".
After a downturn previous year, since October, the number of migrants seeking to cross the southwest U.S. border from impoverished Guatemala, El Salvador and Honduras, as well as from Mexico, has surged.
What was the process after separating families?
A young girl rests on her mother's shoulder as they wait in line to enter the San Francisco office of the Immigration and Customs Enforcement on Wednesday in San Francisco.
Trump told members of Congress that first lady Melania Trump and his daughter Ivanka Trump urged him to reverse course, faced with the images and sounds of crying children locked behind metal fencing. There are now 12,000 children in the custody of the Department of Health and Human Services.More news: Here's a look at Instagram's longform video feature IGTV
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A potential executive order could emerge as a fallback option for the administration if it wants to alleviate the crisis should the House bill not pass - but talk that it is a possibility seems likely to undermine momentum for Republican senators to take a tough immigration vote.
It does, but it's uncertain for how long.
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.
"I didn't like the sight or feeling of families being separated", said Trump.
So, why did Trump sign it?
California leaders argued that the president's order traded one dehumanizing system for another, while doing nothing to reunite the thousands of kids who've been separated with their parents.
In 2016, the 9th U.S. Circuit Court of Appeals ruled that child migrants who came to the border with parents and were held in custody must be released.
Mr Trump had defended the policy, saying he would not allow the United States to become a "migrant camp", but he had recognised the issue was a growing political problem, according to White House sources. But the decision marks a meaningful shift, after top Trump administration officials, including chief of staff John Kelly and Attorney-General Jeff Sessions, said they would keep their heads down and continue on with separations in an effort to "deter" other families from bringing their children to the border.
The House of Representatives is expected to vote on two bills created to end family separations formally and deal with other immigration issues. She was separated from her son the next day, and on May 18 pleaded not guilty to illegally crossing the border because she said she sought out border patrol agents.