Charles Kupperman

The judge found former deputy national security adviser Charles Kupperman is no longer caught between conflicting demands of two branches of government "and lacks any personal stake in the outcome."

An attorney for former national security adviser Charles Kupperman told a federal judge in Washington on Tuesday that the pledge from Democrats that they won't reissue a subpoena cannot be trusted.

A federal judge in Washington was skeptical in the face of arguments that current and former Oval Office aides have "absolute immunity" from ever sitting for questions about interactions with Trump.