House Democrats are threatening to charge a key witness in their impeachment investigation with contempt after he defied a subpoena and failed to show up at the Capitol Monday morning.

Rep. Adam Schiff (D-Calif.), chairman of the House Intelligence Committee, said the lawsuit filed by Charles Kupperman, a deputy to former national security adviser John Bolton, questioning his obligation to appear before Congress “has no basis in law” since Kupperman is now a private citizen. 

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