Measures to prevent the spread of the coronavirus were tightened at the White House on May 11, 2020, after two staff members tested positive for Covid-19. US Vice-President Mike Pence’s spokeswoman Katie Miller and US President Donald Trump’s personal valet both tested positive for the virus in the past week. Senior officials guiding the US coronavirus task force, including Anthony Fauci, Robert Redfield and Stephen Hahn, are self-isolating after having been in contact with the infected…