Considering that the hearings are intended to be public, and impartial. It would seem awfully biased, and an abuse of power to tack additional charges on without interviewing additional witnesses, in public. This sounds to me like they're manufacturing charges out of thin air and trying to pull the same shit they do with most of their bills....sneak a rider into it at the last minute. McGahn will never willingly be allowed to testify, so where will the charges come from? As of 8 hours ago, it appears a House panel is urging the appeals court to pressure him to testify. https://www.ibtimes.com/trump-be-impeached-house-again-new-impeachment-articles-passed-if-theres-new-evidence-2891186