Kamala Harris on Tuesday night faces a task unprecedented in modern political history. On the debate stage in Philadelphia, she will deliver both an opening argument – to the millions of voters who want to know more about her – and a closing argument – for her candidacy and against Donald Trump’s – as their lightning campaign enters its final eight weeks.

It is not the first debate of the campaign. Trump faced Joe Biden on stage in June, weeks before the president dropped out of the race. The debate begins at 21:00 EDT (01:00 GMT) on Tuesday 10 September. It takes place live on US network ABC from the National Constitution Center in Philadelphia, Pennsylvania.