Trump was wearing a mask in Walter Reed's hallway as he began his visit. Most prominent Republicans, including Vice-President Mike Pence, endorsed wearing masks as the novel coronavirus gained ground this summer. Trump, however, has declined to wear a mask at news conferences, coronavirus task force updates, rallies and other public events. WATCH | Are you making these face mask mistakes? :A face mask is meant to limit the spread of COVID-19.

Source: CBC News July 11, 2020 21:47 UTC