Pope Francis remains in critical condition, according to the Vatican, with blood tests showing mild signs of kidney failure “which is currently under control,” the Vatican said Sunday, as the 88-year-old pontiff battles pneumonia in both his lungs.

The press office for the Vatican said Sunday that Pope Francis was able to rest overnight as he slowly recovers from double pneumonia after initially being hospitalized for bronchitis.

Pope Francis remains in critical condition, with the Vatican saying blood tests reveal early signs of kidney failure. Doctors said the pope has not had another "respiratory crisis" since Saturday. Seth Doane reports.