Vice President Biden’s facial expressions and body language didn’t hinder his message at Thursday’s debate, his son, Delaware Attorney General Beau Biden said Sunday morning.

“Look, I'm happy to defend my dad,” Beau Biden said on ABC’s “This Week with George Stephanopoulos.” “I don't think he needs any defensiveness. Any time the other side -- Karl Rove or folks on the far right -- are going after my father for smiling too much, you know that's a victory. My father spoke clearly to the American people about the facts, and you saw him do that for 90 minutes straight.”

Vice President Biden could be seen smiling and laughing throughout the course of the debate in response to statements Republican vice presidential nominee Paul Ryan (Wis.) delivered.

“This isn't, Jake, about how much my father smiled or how many gallons of water that the congressman drank nervously on that stage. It's about talking directly to the American people about very important facts,” Beau Biden continued.

Beau Biden, an Iraq War veteran, also sharply criticized Ryan’s comments during the debate, and suggested he isn't adequately prepared to take on foreign policy and national security issues.

“You had him suggest, if not open the door, to put additional troops in Afghanistan. So it was a remarkable position to take," Beau Biden said. "It demonstrated, I think, that, you know, the congressman is not quite up to speed on foreign policy as you might want a would-be vice president to be.”