 I'm Debbie Russ with the BBC News. Hello. President Biden has sharpened his criticism of Donald Trump, calling him a loser, as he attempted to reignite his election campaign at a rally in Detroit in Michigan. Mr Biden told cheering supporters he wasn't going anywhere. Pressure has been building on him to drop out of the race for the White House due to concerns about his age. Quinn Kleinfelter is from Detroit Public Radio.