Curious about the source and reasoning for a candidate to receive "national security briefings," I turned to the googles; "presidential candidates receive national security briefings".
First result is a 2016 article on Salon. The article offered a link to this article, Intelligence Briefings for the Presidential Nominees, by a 33-year career CIA officer who served a senior level positions.
Seems the sitting president offers the candidates a one time deep overview of the national intelligence landscape not daily briefings, not "intelligence," not documents. But to give an appreciation of just what national intelligence really involves.
Given that reasoning, Biden should deny the Buffoon the courtesy. The Buffoon knows not just the national security landscape but many of the intimate details about which he has demonstrated that he doesn't give a s**t unless it serves his personal interests.
It took a while but to good effect.