Joe Biden had classified material and he knew it, and the audio tapes that Biden fought to hide prove that he knew it. The Hill explains below:Over two hours of audio recordings that former President Biden fought to keep private were released on Monday. “Some of this may be classified, so be careful with it,” Biden told Zwonitzer in an interview on April 24, 2017. Earlier in this interview, Biden discusses a diary entry about a National Security Council meeting, noting that “part of it’s classified.” The released recordings also include frank discussions about tensions between Biden and former President Obama during his time as Obama’s vice president.