According to reports, the agent, who was taken off the case, was frustrated at the glacial pace of the investigation and, concerned about a possible cover-up, told House Majority Leader Eric Cantor (R-Va.) about 10 days before Obama is said to have learned about the scandal. Cantor’s office then reportedly told the FBI about the whistleblower conversation on Oct. 31.

“If it is, as you describe, then I think disciplinary action is in order. But I can’t prejudge it,” Feinstein pointedly told MSNBC host Andrea Mitchell.

“You know, you cannot keep these things from the people who hold the responsibility for oversight. You have to know,” she added of the failure to tell intelligence committee leaders. “What if something else happened and this never came to light and then down the path, something resulted from it?”

Weaving in Thursday’s closed-door Benghazi hearing, at which Petraeus will not be testifying, Feinstein noted Petraeus’ fact-finding trip to Libya shortly before the election.

“I believe that there is a trip report. We have asked to see the trip report. One person tells me he has read it, and then we tried to get it and they tell me it hasn’t been done,” she said. “That’s unacceptable. We are entitled to this trip report. And if we have to go to the floor of the Senate on a subpoena, we will do just that… for the very reason that it may have some very relevant information to what happened in Benghazi.”

The chairwoman also vowed that some of the inquiry will be in open session.

“Was this an intelligence failure? To some respect, if you ask me right now, based on what I’ve seen, I would have to say yes,” Feinstein said. And that’s the timeline of the response and the change from the original talking points, which said it was a likely demonstration, to a terrorist attack 10 days later. I don’t know what took them 10 days to figure that out, candidly. And that’s a problem.”