Russia steps up bombardment of Kyiv, civilians flee Mariupol

U.S. Rep. Brendan Boyle, who represents parts of Philly and is co-chair of the Congressional European Union Caucus, called the move "a direct threat to our national security.”

On Sunday, Volodymyr Zelenskyy visited Pennsylvania's Scranton Army Ammunition Plant, kicking off a U.S. tour to shore up support for Ukraine in its war with Russia.

Attorney General Merrick Garland is expected to signal the depth of U.S. concerns and signal legal actions against those suspected of being involved.