President Donald Trump, called his Democratic rival Joe Biden “stupid” and demanded an apology for what Trump called anti-vaccine rhetoric.

Speaking in front of the White House at a U.S. Labor Day news conference, Trump said: “Biden and his very liberal running mate, the most liberal person in Congress by the way – is not a competent person in my opinion, would destroy this country and would destroy this economy – should immediately apologize for the reckless anti-vaccine rhetoric that they are talking right now,” adding: “It undermines science.”

The president called Biden “stupid.”

Trump has said that a vaccine against the virus would be ready in record time, “perhaps before the election”.