US presidential candidates Donald Trump and Kamala Harris were publicly clashing on Monday over the rules for their highly anticipated first TV debate in September. At the centre of the dispute are the microphones – and whether they should be muted during the debate except for when it is a candidate’s turn to speak. This was the case during Trump’s debate on CNN in June with President Joe Biden, who has since ended his campaign. A spokesman for the Harris team said they favoured both candidates’ microphones remaining switched on throughout the broadcast, which would allow for interruptions. “O…