“Biden..will not be allowed access to classified information or any members of the intelligence community until the General Services Administration officially “ascertains” him as the president-elect — a formality that has traditionally taken place within 24 hours of election day but is being held up by Trump as he continues to challenge the election results.
Biden was given classified briefings as a candidate but those stopped once he became president-elect, and his status as a former vice president and former senator does not afford him access now.”
https://www.politico.com/news/2020/11/19/biden-harris-national-security-access-438259