Roberts and his Republican colleagues decided to preclude the possibility that some recalcitrant senator might ask why INR was able to get it right on Iraq when everyone else was wrong.In other words, the INR might actually say something at the briefing that might embarass the administration.
This is actually pretty astonishing when you think about it. This is an annual briefing, presumably to provide background needed to guide this committee's work in the coming year. One would think then that the committee would want as thorough a briefing as possible, and that would require the inclusion of the INR. What Chairman Roberts has effectively done then is to place national security concerns second behind protecting the President's backside.
And this is the party that claims to be tough on defense? Tough on defending Bush's image perhaps, but the rest of us? We're only second.