Although the Consitution sets a very high bar to convict a person of treason, there is no question that a deliberate corruption of national intelligence, thereby national security, in a time of war is a treasonous act.
Another anti-Constitutional point which Rockefeller and all other elected officials who do this sort of thing is that they violate their oaths of office. Article 4 of the Constitution states: "The Senators and Representatives before mentioned, and the members of the several state legislatures, and all executive and judicial officers, both of the United States and of the several states, shall be bound by oath or affirmation, to support this Constitution...
The Oath of Office for the Legislative Branch reads as follows:
"I do solemnly swear (or affirm) that I will support and defend the Constitution of the United States against all enemies, foreign and domestic; that I will bear true faith and allegiance to the same; that I take this obligation freely, without any mental reservation or purpose of evasion; and that I will well and faithfully discharge the duties of the office on which I am about to enter: So help me God."
In my opinon, Rockefeller should be censured by the Senate for the naked corruption of our Senate's national intelligence and security oversight process. The members of his staff who participated should be fired.