"She doesn't have the look. She doesn't have the stamina," Trump began, responding to a question from moderator Lester Holt.
I said she doesn't have the stamina, and I don't believe she does have the stamina. To be president of this country, you need tremendous stamina," he continued, before changing course and talking about negotiation skills.
"Well, as soon as he travels to 112 countries and negotiates a peace deal, a cease-fire, a release of dissidents, an opening of new opportunities in nations around the world or even spends 11 hours testifying in front of a congressional committee, he can talk to me about stamina," Clinton retorted, to cheers from the audience.