Judge tosses ex-White House aide's lawsuit over impeachment testimony

A U.S. judge on Monday dismissed a lawsuit brought by former White House aide Charles Kupperman seeking guidance on whether he needed to comply with a congressional subpoena in the impeachment inquiry into President Donald Trump.U.S. District Judge Richard Leon in Washington said Kupperman's lawsuit was "moot" because a U.S. House of Representatives committee withdrew a subpoena seeking his testimony.In October, House investigators issued a subpoena to Kupperman for his testimony in their invest