US Democratic presidential nominee Joe Biden has said that if he were elected in November he would be willing to shut down the country again to control the spread of the virus, if scientists recommended it.
Biden made the comments in an interview with US broadcaster ABC alongside his running mate Kamala Harris, reports the BBC.
"I would shut it down, I would listen to the scientists," he said, adding that he would "be prepared to do whatever it takes to save lives, because we cannot get the country moving until we control the virus".
President Donald Trump - his rival for the 3 November election - responded by tweeting that Biden "has no clue!"
Although the US never had a full nationwide lockdown of the kind seen in other countries, many states enforced tough coronavirus restrictions.