Former Vice President Joe Biden Joe BidenSenate Republicans face tough decision on replacing Ginsburg What Senate Republicans have said about election-year Supreme Court vacancies Biden says Ginsburg successor should be picked by candidate who wins on Nov. 3 MORE slammed President Trump's decision Tuesday to rescind the Deferred Action for Childhood Arrivals (DACA) program, calling the move "inhumane" and un-American.

In an emotional and biting Facebook post, Biden cast Trump's decision as an unnecessary affront to hundreds of thousands of young immigrants who are in danger of being "sent to countries they don't even remember."

"These people are all Americans," Biden wrote. "So let's be clear: throwing them out is cruel. It is inhumane. And it is not America.

"Congress and the American people now have an obligation to step up and show our neighbors that they're welcome here, in the only place they've ever called home."

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Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsTrump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status White House officials voted by show of hands on 2018 family separations: report MORE announced Tuesday that the Trump administration would phase out DACA, the Obama-era program that shielded young immigrants who were brought to the U.S. as children from deportation.

But the administration said the phase-out would take place over six months, giving lawmakers an opportunity to pass legislation to address the matter.

Still, the decision drew widespread criticism and sparked many Republican and Democratic lawmakers to call for swift legislative action on protections for DACA beneficiaries.

Former President Barack Obama Barack Hussein ObamaObama calls on Senate not to fill Ginsburg's vacancy until after election Senate Republicans face tough decision on replacing Ginsburg Cruz: Trump should nominate a Supreme Court justice next week MORE said in a Facebook post that Trump's decision was "cruel" and rooted in the president's own political interests.

"It's a political decision, and a moral question," he wrote. "Whatever concerns or complaints Americans may have about immigration in general, we shouldn't threaten the future of this group of young people who are here through no fault of their own, who pose no threat, who are not taking away anything from the rest of us."