President Trump went out for a brief drive Sunday and waved to supporters from an SUV near the Walter Reed Medical Center, USA Today reports. In a tweeted video, his motorcade can be seen cruising a sidewalk lined with people hooting and hollering as they wave pro-Trump flags. Trump wears a mask as he sits in the back seat with two Secret Service agents who also wear masks, per the Hill. "It's been a very interesting journey, I learned a lot about COVID," Trump said in a video shot earlier at the hospital. "I learned it by really going to school. This is the real school. This isn't the let's-read-the-book school, and I get it, and I understand it." (He said in an earlier video that "the real test" is coming. See doctors are saying about his health.)