U.S. President Joe Biden said on Tuesday he was unaware of the contents of classified official documents dating back to his tenure as vice president under Barack Obama (2009-2017) and that they were finally found at a research center in Washington from Biden told reporters: “I was briefed on what was discovered and was surprised to learn that documents relating to the government had been turned over to this office. I don’t know what those documents contain,” stressing that his lawyers would be “fully cooperating” as they reviewed those documents.