"Director Comey affirmed that he is proceeding 'by the book' as it relates to law enforcement," Rice wrote. "From a national security perspective, Comey said he does have some concerns that incoming NSA Flynn is speaking frequently with Russian Ambassador Kislyak. Comey said that could be an issue as it relates to sharing sensitive information. President Obama asked if Comey was saying that the NSC should not pass sensitive information related to Russia to Flynn. Comey replied 'potentially.' He added that he has no indication thus far that Flynn has passed classified information to Kislyak, but he noted that 'the level of communication is unusual.' The President asked Comey to inform him if anything changes in the next few weeks that should affect how we share classified information with the incoming team. Comey said that he would."