If anything, Trump's tweet just proves that outrage over the draconian policy isn't going away. "Border Security laws should be changed but the Dems can't get their act together!"
"The use of immigration detention and family separation as a deterrent runs counter to human rights standards and principles", she says.
The UN Human Rights Office has urged the White House to halt its zero-tolerance policy of separating parents from their children at the US-Mexico border, reports Newsweek.
Shamdasani stressed that children's rights were "generally held in high regard" in the United States, but she lamented that the country was the only one in the world that had not yet ratified the UN Convention on the Rights of the Child.
Most crossing the U.S. southern border are from Guatemala, Honduras and El Salvador where there is rampant violence and persecution targeting children and young adults, he said. The HHS is now required to fingerprint all immigrant parents coming forward to claim their children, creating a fear of prosecution for coming to collect them.
She also said, "The practice of separating families amounts to arbitrary and unlawful interference in family life, and is a serious violation of the rights of the child".
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Shamdasani told a United Nations briefing Tuesday that the practice of separating families amounted to an "arbitrary and unlawful" interference in family life, calling it a "serious violation" of the rights of children.
"Detention is never in the best interests of the child and always constitutes a child rights violation", she said.
And Attorney General Jeff Sessions, the Trump administration's top law enforcement official, said the policy was legal and necessary.
Around 550 children are now in custody at the USA border and almost 300 of them have spent more than 72 hours there, the time limit for immigrants to be kept in these temporary holdings, according to a report by NBC News.
The zero-tolerance policy is an attempt to reduce the thousands of Central Americans, primarily from El Salvador, Guatemala, and Honduras, who cross the US-Mexico border each week asking for asylum from violence in their own countries, according to the Guardian.
Asked about comments by senior U.S. officials that it was normal to remove children from parents in custody, Ms Shamdasani said: "There is nothing normal about detaining children".