Among those speaking today will be John Kerry, Special Presidential Envoy for Climate.
In an off-the-cuff remark, Mr Biden called Mr Xi a "dictator" following four hours of talks on Wednesday.
Mr Biden also used the term in June, prompting the Chinese foreign ministry to describe the comment as "extremely absurd and irresponsible."
"Look, he is. He’s a dictator in the sense that he’s a guy who runs a country that is a communist country that’s based on a form of government totally different than ours," Mr Biden said as he walked away from the stage.