While the Vatican has detailed laws and rituals to ensure the transfer of power when a pope dies or resigns, they do not apply if he is sick or even unconscious. And there are no specific norms outlining what happens to the leadership of the Catholic Church if a pope becomes totally incapacitated.

Pope Francis, head of the Roman Catholic Church, has held his title for 12 years. What to know about the Jesuit.

Vatican officials Monday said Pope Francis remained in critical condition, but has shown slight improvement in laboratory tests. As he continues to battle pneumonia in both lungs, prayers are growing worldwide for The Holy Father.