Charles Kupperman, a former aide to one-time national security adviser John Bolton, defied a Congressional subpoena to testify before House investigators and instead filed a lawsuit to determine whether he had to comply with the subpoena

Charles Kupperman, a former aide to one-time national security adviser John Bolton, defied a Congressional subpoena to testify before House investigators and instead filed a lawsuit to determine whether he had to comply with the subpoena https://t.co/smFK70YM2E pic.twitter.com/xM8GO4bcjl

— Reuters (@Reuters) October 29, 2019