Pentagon blocks visits to military spy agencies by Biden transition team - The Washington Post

... Current and former officials, who spoke on the condition of anonymity to discuss a sensitive matter, said the delays have impaired the Biden team's ability to get up to speed on espionage operations against Russia, China, Iran and other U.S. adversaries...

https://www.washingtonpost.com/national-security/pentagon-blocks-biden-transition-team/2020/12/04/2e7042fa-3656-11eb-a997-1f4c53d2a747_story.html