House Intelligence Chairman Adam Schiff said Monday that former national security adviser John Bolton's deputy Charles Kupperman may be held in contempt after he failed to comply with a subpoena to testify in the impeachment inquiry into President Donald Trump. "Witnesses like Dr. Kupperman need to do their duty and show up," Schiff told reporters after Kupperman failed to appear for a scheduled deposition. Schiff, D-Calif., said he believes that Kupperman's testimony before the House Intelligence, Oversight and Foreign Affairs committees "would corroborate the allegations of misconduct that other witnesses have made." Schiff, who has been leading the impeachment probe...