Vatican officials announced on Sunday that Pope Francis is currently suffering from "mild renal insufficiency" amid his treatment for bilateral pneumonia.

The Vatican described his condition as critical for the first time on Saturday, reporting that the 88-year-old Francis needed supplemental oxygen and blood transfusions after a "prolonged asthma-like respiratory crisis.

Francis is being treated for pneumonia, a complex infection and kidney problems that have left him in critical condition. He did some light work on Monday.