President Donald Trump wears a mask as he walks down the hallway during his visit to Walter Reed National Military Medical Center in Bethesda, Md., Saturday, July 11, 2020. Trump flew by helicopter to Walter Reed National Military Medical Center in suburban Washington to meet wounded servicemembers and health care providers caring for COVID-19 patients. I think it's expected to wear a mask.Trump was wearing a mask in Walter Reed's hallway as he began his visit. Trump, however, has declined to wear a mask at news conferences, coronavirus task force updates, rallies and other public events. The only time Trump has been known to wear a mask was during a private part of a tour of a Ford plant in Michigan.