AdvertisementLawyer: Bolton Aide Charles Kupperman Fears House Will Reissue Subpoena For TestimonyDecember 10, 2019Bobby AllynfacebookEmailAttorney Charles Cooper, representing former national security aide Charles Kupperman (center) departs federal court in Washington in October. On Tuesday, Cooper asked a federal court to keep alive a lawsuit centered on a now-withdrawn subpoena filed by House Democrats that sought Kupperman's testimony as part of the impeachment inquiry. (Bloomberg via Getty Images)