Pope Francis suffered two episodes of "acute respiratory insufficiency" on Monday, the Vatican said, a setback for the 88-year-old pontiff as he battles double pneumonia. Francis, who has been in Rome's Gemelli Hospital since February 14,

Pope Francis suffered two new acute respiratory crises Monday and was put back on noninvasive mechanical ventilation, in another setback to his battle to fight pneumonia, the Vatican said.

The 88-year-old pontiff has been hospitalized since Feb. 14 after a bout of bronchitis worsened and turned into a complex pneumonia in both lungs.