Preview of Tonight's First 2020 Presidential Debate

President Trump and Democrat Joe Biden square off in the first of three general-election presidential debates Tuesday night.

The debate is high stakes and carries risks for both candidates.

Here are six questions ahead of the debate, to be moderated by Fox News Sunday host Chris Wallace beginning at 9 p.m. ET and held at Case Western Reserve University in Cleveland.

1. Can Trump avoid the sitting-president first-debate slump?

Presidents up for reelection often struggle in their first debates. It happened to Barack Obama, both Bushes, Ronald Reagan and Jimmy...

When President Trump and Joe Biden meet on stage in Cleveland,on Tuesday night, they arrive as two well-known entities. Mr. Trump, the incumbent president who shares his opinions on Twitter every day and in almost daily media appearances, and Biden, the Democratic nominee who has been in public life for decades.

But Tuesday marks the first time they will tangle face-to-face as the nation watches. That first debate will answer a number of questions, and set the tone for the next two, even as Americans have already begun casting...