PRESIDENT Joe Biden staggered and stumbled through his 90-minute debate with Donald Trump, prompting calls by top Democrats that he should consider ending his re-election bid. Biden, 81, locked horns with former President Donald Trump, 78, in the first official debate of the 2024 election cycle. 10 President Joe Biden spoke in a low voice throughout the first debate Credit: Reuters 10 It is the first time in history that a sitting US president is facing off with a former US president Credit: AFP 10 Some viewers questioned whether his low-energy performance reflected poorly on his health Credit: Reuters 10...