Gunther speaks:

After all this discussion of rogue nobles, my master has decided to propose a Charter Amendment that had been discussed in back channels (OOC thread) many years ago.

CA 8.3: In addition to the Kaiser, an Emergency Session of the Diet may be called by the Prinz, or if three of the four House leaders (Dukes or Stewards) agree to do so.

Please be aware that Duke Otto is not casting any doubts on Kaiser Henry, in fact my lord fully supports the Emperor and his agenda. However his personal experience in some past matters has led him to believe this might be a wise precaution to take.