A look at President Trump’s contacts before he announced he tested positive

President Trump’s announcement Friday that he and the first lady, Melania Trump, had tested positive for the coronavirus sent government officials scrambling to determine who else might have been exposed. Two senators who attended a White House event last Saturday said they had tested positive, too, as did Chris Christie, who is advising Mr. Trump’s campaign.
Several people who met with the president this week said they had since tested negative. But it can take days for so