"This drama between Dean and Ehrlichman took place while I was trying to give the contents to the FBI"

This quote is describing a dispute between Dean and Ehrlichman, 2 members of the Nixon administration, while Fred F. Fielding was trying to turn over documents to the FBI. This drama most likely included the two guys disagreeing on how to deal with the circumstance, with Fielding caught in the middle. It is possible that Dean and Ehrlichman were arguing over the contents of the files, or the way in which they ought to be handed over to the FBI. It is likewise possible that the 2 men were arguing over the ramifications of the documents, and the possible repercussions of handing them over to the FBI. Whatever the case, Fielding remained in a difficult position, as he was entrusted with providing the files to the FBI while the 2 men were in dispute.