The US reported its highest daily number of Covid-19 deaths on Tuesday with more than 4,320 fatalities attributed to the virus. It marked the second time -- both this month and since the pandemic's start -- that the US reported more than 4,000 Covid-19 deaths in a single day. Over the past week, the US has averaged more than 3,300 deaths every day, a jump of more than 217% from mid-November.