No reports were found to support the statement saying Donald Trump was under ventilator support. He returned to White house fit and fine.
U.S. President Donald Trump and the first lady Melania Trump had tested positive for coronavirus on October 2, 2020. Trump was admitted to the Walter Reed National Military Medical Center in Bethesda, Maryland. According to the President's medical team, dexamethasone steroids had given to the President after his blood oxygen level dipped. On October 4, doctors stated that his oxygen saturation level was on and off, so they have suggested supplemental oxygen for him. Later the oxygen level increased by over 96%. He was under close monitoring by the staff. On October 5, the President got discharged from the Walter Reed National Military Medical Center at 6:30 p.m and headed back to the White House.
Hence, the reports and doctors' statements confirm that Trump was not in the ventilator support.
The COVID-19 pandemic has given rise to a lot of potentially dangerous misinformation. For reliable advice on COVID-19 including symptoms, prevention and available treatment, please refer to the World Health Organisation or your national healthcare authority.