Donald Trump briefly departed Walter Reed Medical Center on Sunday evening, riding in an SUV with rolled-up windows to wave to supporters gathered outside. Confusion continued Sunday about the severity of Trump’s condition, as his physician revealed the president had been given a dose of a powerful steroid that the WHO for patients who are critically ill with COVID-19.

Dr. Sean Conley, the White House doctor, said Trump had been given dexamethasone and had experienced two drops in his oxygen levels since the onset of his illness. Dexamethasone has been shown to improve outcomes for patients with severe cases of COVID-19, including those who require supplemental oxygen, but isn"t recommended for use in patients with milder cases.

Conley said the president"s move to Walter Reed on Friday was prompted by Conley’s concern about the rapid progression of his symptoms from Thursday night into Friday morning, with a high fever and low oxygen levels. Conley said Trump was given supplemental oxygen on Friday before he was brought to the medical center.