That depends on the contents of the confidential memo. Looking at the contents of these confidential memos, no crime.
If you think it is a crime, cite the crimial statute that has been violated.
https://fas.org/sgp/crs/secrecy/law-leaks.pdf
CRS R41404 - Criminal Prohibitions on Leaks
Obstruction of justice related to Flynn.
18 US Code 1905. Disclosure of Confidential Information