Comey was just asked by Rep. Trey Gowdy if he could assure the American public that the leaking is being investigated. He said no. Not that it is or isn't, but that he won't confirm it. He's pretty much telling everybody that the FBI is taking everything very seriously, but he won't speak to anything having to do with any specific person.
He then answered every question about specific events by saying he can't comment.
...but hey, do what you want...you will anyway.