Kamala Harris and Donald Trump will meet for the first time face-to-face Tuesday night for perhaps their only debate, a high-pressure opportunity to showcase their starkly different visions for the country after a tumultuous campaign summer. The event, at 9 p.m. Eastern in Philadelphia, will offer Americans their most detailed look at a campaign that’s dramatically changed since the last debate in June. In rapid fashion, President Joe Biden bowed out of the race after his disastrous performance, Trump survived an assassination attempt and bothsides chose their running mates.