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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 investigation into allegations that Trump improperly withheld security money as leverage to pressure Ukraine to investigate political rival Joe Biden.