However, there is no clear procedure for a declaration of incapacity other than the self declared incapacity; thus if the president were to fall under a severe illness, and refused or were unable to sign a message to Congress spontaneously declaring his incapacity, there is no straightforward constitutional provision specifying the procedure required for the presidential impediment to be recognized. It is speculated that, if an incapacity were to exist, and if no spontaneous self declaration took place, it would fall to Congress to recognize such incapacity, but no procedure or quorum is clearly established.