I am on the fence with this one. I agree that we should use all means necessary to root out Islamicist terrorists. But can you imagine Bill Clinton and Hillary being in charge of the FBI under this law? Good god. Anyone's library reading habits could be exposed, with one Clinton appointee judge signing the warrent in secret, for any "secret" cause. And the Librarians would be prosecuted if they raised a flag.
Picture this: You support the 2nd ammendment vigorously. On some internet forum, you state that you would rather fight than let the government confiscate your weapons, like what happenned in England. Hillary's stooges see that message, get a secret warrant to search what you have read in the library. You checked out a book on anything to do with homosexuality--just to gain info to fight back. They now have you under their thumb, threatening to expose your reading list to the public. In fact, they leak it to the press.
Under Clinton, this would happen.