Former President Donald Trump and Vice President Kamala Harris are set to square off in their first debate ahead of November's presidential election on Tuesday (September 10) night at the National Constitution Center in Philadelphia.

Trump led Harris 48%-47% among likely voters in a Times/Siena poll taken Sept. 3-6, equal to the former president’s one-point advantage six weeks ago—marking one of Trump’s first leads by a major pollster since Fox News found him up 50%-49% in early August (the Times/Siena survey had a margin of error of 2.8 points).

The debate on Tuesday between Kamala Harris and Donald Trump will mark the first time the two politicians have ever met.