The first presidential debate between President Trump and Joe Biden featured a chaotic series of bitter exchanges and name-calling, with the president repeatedly speaking over his Democratic rival and the moderator struggling to maintain control of the 90-minute affair.

"Will you shut up, man?" an exasperated Biden said in a comment that was emblematic of the tumultuous nature of the debate, which was held in Cleveland, Ohio. "It's hard to get any word in with this clown."

The president leveled barrages of unfounded accusations against his Democratic rival and his family, invoking his son Hunter Biden's work in Ukraine and bringing up the younger Biden's history of drug abuse. Mr. Trump declined to condemn white supremacist groups and defended his response to the coronavirus pandemic that has claimed more than 200,000 American lives, trying to portray Biden as a socialist who isn't equipped to occupy the Oval Office.

"Did you use the word smart?" the president asked Biden at one point. "You graduated either the lowest or almost the lowest in your class. Don't ever use the word smart with me, Joe."

Biden, for his part, tried to direct his answers to the audience watching at home. He called Mr. Trump "the worst president America has ever had," blaming him for bungling the response to the pandemic and fueling racial divisions amid recent protests against police brutality.

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