The committee is, to put it bluntly, basically under the control of the White House,Having learned that Chuck Hagel is insulted by being called a boot licker...(here's a hint, STOP LICKING BOOTS), the Rock, Wednesday:
[O]n Wednesday, the Democratic vice chairman of the committee, Senator John D. Rockefeller IV of West Virginia, issued a conciliatory statement, saying that while he favored a full investigation, a committee decision on Tuesday to appoint a seven-member subcommittee to oversee the N.S.A. eavesdropping was "a step in the right direction."
Update: G.G. has the text of Rockefeller's apologetic non-apology. Battlepanda has a cheat sheet in case Rockefeller is confused as between whiffleball at a barbecue and national politics: