 He also called his deputy, Kamala Harris, Vice President Trump. Mr Biden insists he's fit to run for a second term and he's received the backing of international allies. President Emmanuel Macron of France called the mistakes just a slip of the tongue and said he was on top of matters. Support among Democrats in the US is wobbling. But Ben Rhodes, who was Barack Obama's speechwriter, said most of Mr Biden's news conference had been clear and coherent.