NSA Wiretaps Won't Be Investigated?

Reading the New York Times front page, the House has agreed to investigate the NSA controversy, but possibly not the program itself. Instead, there is talk of looking at the law involved to see if it needs to be changed.
Wait a sec. The NSA, presumably under the directive of the President and/or his administration, broke the law and the constitution (see 4th Admendment: http://en.wikipedia.org/wiki/United_states_consitution#Fourth_Amendment). Yet, Republicans are caving into Bush's pressure to change the law rather then investigate wrong-doings. What is the point of seperation of powers?
I only read this on the New York Times. The press seemed to be so wound up on "Cheney shot a man in the head" case that they put this in the back burner.
I do hope Republicans actually investigate the NSA domestic wiretaps in themselves, and not the law. The FISA court has already shown to be historically favorable to granting wiretaps, I highly doubt we need to change the law. People need to know that they weren't wiretaped, and that such wiretaps weren't put up by flimsy evidence (a possible reason why no warrents were obtained on these). This is a case where transparency is much better then secrecy. Also, congressional Republicans need to show that they aren't Bush's lapdogs.

UPDATE: ABCNews has reported that Bill Frist said on CBS's "Face the Nation" that he believes that not only the law is good as is, but also standing by Bush's claim that the program is completely legal (story: http://abcnews.go.com/Politics/wireStory?id=1639748).
Let me remind everybody that the law in which Bush and his administration has been citing was the resolution to go to war, citing the vague "any force nessisary" clause. From what I have been hearing, between the bill that created FISA and the cited laws, courts would rule with FISA since it is far more specific.
It's unfortunate that the current political environment always seems to have a "with us/against us" type of policies, especially within one's own parties. I just would be good to explain to everyone, Democrat and Republican, that from the information that has been leaked, this program is illegal and shouldn't be in place. There just is no excuse for not at least looking into the legality of this program, even less to change the law to make it legal.