What would Diane Feinstein not leak? Anything that might harm Democrats. That seems to be a reasonable observation based on her media leaks.
Her release of the transcript of the interview with Glenn Simpson of Fusion GPS wasn't the first. Her reason is known to her. But at least one Senator made the observation that the release would provide a way for future witnesses to get their stories coordinated. See Chuck Grassley: Dianne Feinstein's leak could make people 'more reserved' about testifying.
Another Feinstein leak was the outing of James Mitchell, one of the psychologists who implemented enhanced interrogation techniques on captured terrorists. See Hypocrisy alert -- Democrats feigned outrage over alleged Valarie Plame outing by a Republican but go silent when one of their own does it in this blog.
There's one thing we can probably count on, and that's that she won't leak anything that could harm Democrats. However, anything that can harm Republicans is fair game.
2:38 PM 1/12/2018