But... he did lie under oath.

Comey memo leaked to Times - May 11 at the latest

Trump Tweets about tapes - May 12

Comey says that Trump tweet about tapes caused him to leak memos to Times -

Mr. Comey said he decided to make the conversation public through an intermediary after Mr. Trump said on Twitter that the former F.B.I. director had better hope there were no tapes of their discussions. He said he did so with the explicit hope of triggering the appointment of a special counsel to investigate Russian election interference. “I woke up in the middle of the night on Monday night, ‘cause it didn’t dawn on me originally that there might be corroboration for our conversation; there might be a tape,” Mr. Comey said, referring to May 15. “And my judgment was I needed to get that out in the public square so I asked a friend of mine to share the content of the memo with a reporter. Didn’t do it myself for a variety of reasons but I asked him to because I thought that might prompt the appointment of a special counsel. So I asked a close friend of mine to do it.”

https://www.nytimes.com/2017/06/08/us/politics/james-comey-testimony-hearing.html