Joe Biden said Tuesday that wearing a mask in public to combat the spread of the coronavirus is a sign of leadership and called President Donald Trump a “fool” who was “stoking deaths” for suggesting otherwise. The presumptive Democratic presidential nominee’s comments came a day after he wore a black face mask while making his first public appearance in more than two months. Biden has remained at his Delaware home amid a pandemic that has frozen the presidential campaign, but he marked Memorial Day by laying a wreath at a nearby veterans' memorial with his wife, Jill. Trump later retweeted a post that appeared to make fun of a photo of Biden in his mask, though he later said he didn't mean to be critical.