Sen. Bernie Sanders Bernie SandersKenosha will be a good bellwether in 2020 Biden's fiscal program: What is the likely market impact? McConnell accuses Democrats of sowing division by 'downplaying progress' on election security MORE (I-Vt.) is ripping the Trump administration for ending a key Obama-era immigration program aimed at protecting undocumented immigrants brought into the country as children.

"Trump's decision to end the DACA program ... is the cruelest and most ugly presidential act in the modern history of this country. I cannot think of one single act that is uglier and more cruel," Sanders said from the Senate floor.

Senate Democrats took over the Senate floor on Wednesday to protest the decision to wind down the Deferred Action for Childhood Arrivals (DACA) program.

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Democrats are demanding a stand-alone vote on the Development, Relief, and Education for Alien Minors (DREAM) Act. Similar to DACA, it would allow people brought to the United States illegally as children to continue to live and work freely in the country.

Sanders added that Congress should pass the DREAM Act "as soon as possible."