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Russia’s invasion in February 2022 displaced millions of refugees, most of them women and children, triggering the largest refugee exodus in Europe since World War II. As other European countries like Poland and Germany absorbed these refugees, the U.S. quickly followed suit, with President Biden vowing to welcome 100,000 Ukrainians.

In April 2022, the Biden administration created an unprecedented program known as “Uniting for Ukraine,” allowing an unlimited number of Ukrainians sponsored by Americans to come to the U.S. and work here legally without having to go through the lengthy visa process.

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In two years, U.S. immigration officials have approved more than 236,000 cases under the Uniting for Ukraine program, according to the Department of Homeland Security. As of the end of March, more than 187,000 Ukrainians had arrived in the U.S. under the policy.

Another 350,000 Ukrainians have arrived in the U.S. outside of the sponsorship process since the start of the Russian invasion, mainly through temporary visas, according to DHS.

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Republican-led states, for example, have filed lawsuits against virtually every major Biden administration immigration policy, including a similar sponsorship program for migrants from Cuba, Haiti, Nicaragua and Venezuela. But the Uniting for Ukraine program has not been challenged in court. In fact, some Republican lawmakers have expressed support for welcoming Ukrainian refugees.