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According to the 4th amendment, "warrants" must be used in specific investigations and for specific individuals. There's nothing specific about a FISA warrant. They just get data en masse from a lot of people. And they use this paper that they are calling a "warrant" from the FISA court, that says they can get the data on everyone.
Also, FISA warrants completely ignores such things as "probable cause" and "reasonable searches", which are pretty important for a democracy, I'd say. You can't say you're getting all the data of 100 million people, and also have "probable cause" for them.
"The Fourth Amendment (Amendment IV) to the United States Constitution is the part of the Bill of Rights which guards against unreasonable searches and seizures, along with requiring any warrant to be judicially sanctioned and supported by probable cause. It was adopted as a response to the abuse of the writ of assistance, which is a type of general search warrant, in the American Revolution. Search and seizure (including arrest) should be limited in scope according to specific information supplied to the issuing court, usually by a law enforcement officer, who has sworn by it."
https://en.wikipedia.org/wiki/Fourth_Amendment_to_the_United...