"I had difficulties understanding what he was saying, and I understand English pretty well."
"You're a man of huge integrity, Joe, and you must - you MUST - stand down."
There is a process for doing so, but it would be messy and expensive for the Democrat Party.
Each called the other the worst president in history.
The 90-minute televised debate took place more than four months out from the US presidential election in November.
The current and former US Presidents went head-to-head in Atlanta for the first time in four years.
"(It is) unbelievably historic. You cannot (over) hype up the importance of this."
The Secret Service member fired their gun in response.
It could help Republicans win over working-class voters.
