WASHINGTON — ABC News has declined to adopt Vice President Kamala Harris’ request to have wholly unmuted microphones during her Sept. 10 debate with former President Donald Trump — after days of wrangling over what Republicans viewed as Democratic attempts to lay a trap for the GOP nominee. A network email reviewed by The Post lays out similar rules as those for Trump’s June 27 CNN debate against President Biden — including no audience, no pre-written notes or props and muted mics when a candidate is not speaking. Trump and Harris will be standing on stage and will only be...