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Impeachment witness asks federal judge to decide if he is obliged to testify – CNNPolitics
Impeachment witness asks federal judge to decide if he is obliged to testify
Charles Kupperman, who served until last month as deputy national security adviser at the White House, filed a lawsuit Friday asking a federal judge to rule on whether he is obliged to testify before House investigators. The case presents a new challenge to House Democrats seeking cooperation from close aides of Trump. Kupperman, who worked …