Vice President Joe Biden is dismissing as "rhetoric but not much substance" Mitt Romney's answers to questions at Tuesday night's presidential debate.

Joe Biden on the Today Show (NBC)

"Everything is sketchy," Biden said in an interview aired Wednesday on NBC's "Today" show.

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Biden also addressed questions raised by Republicans over the Obama administration's response to requests for increased security at the U.S. consulate in Benghazi, Libya. The U.S. ambassador and three other Americans were killed there last month. At last week's vice presidential debate, Biden had asserted "we weren't told" about the requests. But a State Department official had acknowledged receiving the request during congressional testimony.

Biden said he meant that he and President Barack Obama were not personally aware of the requests. "It never got to us," Biden said.