Several law professors told us there are no laws prohibiting Comey from sharing conversations he had with Trump in an unclassified manner.
“It absolutely is legal for Comey to share his own private reflections that do not consist of closely held national security secrets with the press, whether by passing on the information himself or through a friend,” said Heidi Kitrosser, a law professor at the University of Minnesota.
“Anti-leak” laws like the Espionage Act only apply to closely held national security information, Kitrosser said.
“There is absolutely no basis that I have seen to believe that Comey’s private recollections fall into that category,” Kitrosser added.
Source: Donald Trump: Comey’s leak of memo ‘totally illegal?’ | PolitiFact