actually. >> reporter: the president now echoing the concerns of his attorney rudy giuliani, that an interview could be a, quote, perjury trap. saying, it's my word against comey. and he's best friends with mueller. so mueller might say, well, i believe comey and even if i'm telling the truth, that makes me a liar. that's no good. >> how do we know what the truth is? >> you're talking about whether or not the president asked james comey to go easy on michael flynn. >> that's right. they will possibly charge him with perjury should he give that answer. that's why i'm saying, in situations like this, the prosecutors, the truth is relative. >> reporter: the debate over an interview coming as sources tell cnn that the president was unsubtled that he did not know that the conversations between the white house counsel don mcgahn and mueller lasted 30 hours over several months or that his legal team did not conduct a full debriefing with mcgahn after the fact.