Pope Francis rested overnight in the hospital, the Vatican said on Sunday. "The night passed peacefully. The Pope rested," the Holy See said in a short statement. The 88-year-old pontiff underwent another round of clinical tests on Sunday morning,

Pope Francis, battling double pneumonia, remains in a critical condition and his prognosis is still guarded because of the "complexity" of his clinical condition, the Vatican said on Sunday.

Pope Francis was in critical condition Saturday after he suffered a long asthmatic respiratory crisis that required high flows of oxygen, the Vatican said.