Trump, Biden prepare to debate at a time of mounting crises

Preparations take place for the first Presidential debate in the Sheila and Eric Samson Pavilion, Monday, Sept. 28, 2020, in Cleveland. The first debate between President Donald Trump and Democratic presidential candidate, former Vice President Joe Biden is scheduled to take place Tuesday, Sept. 29. (AP Photo/Patrick Semansky)

A camera operator waits for a rehearsal ahead of the first presidential debate between Republican candidate President Donald Trump and Democratic candidate former Vice President Joe Biden at the Health Education Campus of Case Western Reserve University, Monday, Sept. 28, 2020, in Cleveland. (AP Photo/Julio Cortez)

Mock debaters stand onstage as preparations take place for the first Presidential debate in the Sheila and Eric Samson Pavilion, Monday, Sept. 28, 2020, in Cleveland. The first debate between President Donald Trump and Democratic presidential candidate, former Vice President Joe Biden is scheduled to take place Tuesday, Sept. 29. (AP Photo/Patrick Semansky)

CLEVELAND — In an election year like no other, the first debate between President Donald Trump and his Democratic challenger, Joe Biden, could be a pivotal moment in a race that has remained stubbornly unchanged in the face of historic tumult.