Pope Francis, battling double pneumonia, remains in a critical condition for a second day running and has shown an "initial, slight insufficiency" in his kidney function, the Vatican said on Sunday. The prognosis for the 88-year-old pope,

Pope Francis rested overnight in the hospital, the Vatican said earlier Sunday, adding that his night "passed peacefully."

Pope Francis remains in critical condition following a prolonged respiratory crisis and while his blood tests show slight improvement in his anemia, his platelet count remains low and he is now is being treated for a slight renal insufficiency.