 The US President Joe Biden's used social media to attack Donald Trump's acceptance speech at the Republican National Convention as calls grow for the president not to seek re-election. Mr Biden's been isolating at home while recovering from Covid. At the same time, calls are growing for him not to seek re-election with concerns mounting about his health and mental acuity. Speaking to the BBC, the Democrat Congressman Adam Smith said he thought Vice President Kamala Harris would be the right candidate.