A "TIME BOMB"

Reince Priebus is scared to death that James Comey has notes on a conversation they had (which he almost certainly does)

http://www.thedailybeast.com/articles/2017/05/24/reince-priebus-sweating-secret-comey-memos-white-house-sources-say
Three White House officials told The Daily Beast that Chief of Staff Reince Priebus has privately expressed worry about a possible Comey memo specifically