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PBS News Hour
Trump escalates impeachment battle, refusing to cooperate
After the Trump administration barred a key witness from testifying, the White House informed congressional Democrats that it will not cooperate with their impeachment inquiry. Democrats said they are subpoenaing the U.S. ambassador to the E.U., and suggested blocking testimony may be an impeachable offense. Lisa Desjardins reports, then joins Yamiche Alcindor and Judy Woodruff for more.
