Mitt Romney criticized Vice President Biden on Friday for “directly contradicting the sworn testimony of State Department officials” during Thursday night’s vice presidential debate, picking up on GOP attacks leveled at the vice president in the hours since the exchange.

“He’s doubling down on denial and we need to understand exactly what happened as opposed to just having people brush this aside,” Romney told a crowd gathered outside an auto dealership in Richmond. “When the vice president of the United States directly contradicts the sworn testimony of State Department officials, American citizens have the right to know just what’s going on.”

Biden said that “we” were unaware of security concerns in Libya. On Friday, White House officials clarified Friday that the vice president was speaking for himself and President Obama. State Department officials, they said, had not passed on requests for more security.

Romney credited his running mate, Rep. Paul Ryan (R-Wis.), for his debate performance, calling the lawmaker “thoughtful, respectful, steady, poised, the kind of person you want to turn to in a crisis.”