Joe Biden launches campaign, equates ex-President to Nazis

US President Joe Biden launched his harshest attack yet on Donald Trump, accusing the Republican of echoing Nazi Germany and posing a threat to democracy. Biden branded his likely challenger a 'loser' and 'sick' in a speech on the eve of the third anniversary of the deadly January 6 Capitol attack. He accused Trump of instigating the Capitol attack and warned that if Trump won a second term, democracy itself was at risk.