Pope Francis remained in critical but stable condition Tuesday, with his blood parameters remaining stable as he works from the hospital while battling double pneumonia, the Vatican said. The Vatican's evening update said the 88-year-old pope underwent a follow-up CAT scan in Tuesday evening to check the lung infection.

Pope Francis has also written a letter of resignation, to be invoked if he became medically incapacitated.

ROME (AP) — Pope Francis, hospitalized in critical condition with double pneumonia, was well enough to meet with the Vatican secretary of state to approve new decrees for saints and call a formal meeting to set the dates for their canonization, the Vatican said Tuesday.