At least, that seems to be the mentality of the president when it comes to the eavesdropping program. He says it's legal, and we know that when he says it's legal, it's legal. After all, he did graduate from the best law school in the country, wait no he didn't. Legal expertise must come from being head of the judicial branch, wait, no, he's not in the judiciary, he's an executive. Which is why he can continue to do what many surmise to be illegal because nobody in a position to tell him otherwise has told him otherwise. This might be due, however, to his denial of security clearances for investigators into the program. If you want to make sure that you don't get in trouble for doing something you shouldn't be doing, then it helps to not give the nosey parkers access to what they need to make an informed decision.
If it's not illegal, then why deny access to the program? If it is illegal, then is it not wrong to deny access to the investigators?