4/20: Russia pounds Ukraine overnight, as holdouts refuse to surrender in Mariupol. White House weighs in amid uncertainty following the end of the travel mask mandate.

The last Ukrainian holdouts against a Russian offensive -- in a crucial city in southern Ukraine. Russia has shared this video of smoke rising from a steelworks in Mariupol, where it's estimated thousands of Ukrainians -- troops and civilians -- are under siege. The Biden administration says it will wait for the CDC's guidance -- on whether to appeal a judge's ruling that struck down mask mandates on airplanes and public transit. So far, the CDC hasn't given any guidance on that. Two men accused of posing as Homeland security agents now face new weapons charges. What's being called a wall of fire has forced hundreds of people out of their homes in northern Arizona. Snow is falling in the mountains in California, and that's good news for areas that didn't get enough snowfall during the winter.

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