U.S. Rep. Ken Buck has been largely absent from closed door-impeachment hearings, according to an analysis of depositions by The Colorado Independent.

Buck, who is a member of the Judiciary and Foreign Affairs committees, was present for the testimony of Ukraine Ambassador William Taylor, out of a total of 15 witness depositions, The Independent found. Attendance among all members varied widely.

There are a number of reasons why members might miss a hearing, including scheduling conflicts or arriving late and not being included during a roll call.

Buck’s office did not respond to a Colorado Politics request for comment.

The House Permanent Select Committee on Intelligence recently concluded two weeks of public testimony from Taylor and others in its impeachment inquiry. Some congressmen, including U.S. Rep. Doug Lamborn, have slammed the process, calling it a “Soviet-style kangaroo court” and a “circus.” Lamborn does not sit on the committees overseeing impeachment.

The Intelligence committee’s chairman, Adam Schiff, said that part of the reason for closed-door testimonies was to prevent witnesses from coordinating their stories.