It's troubling that this type of data gathering doesn't require a warrant. The American Government can't expect oppressive countries to clean up their act when the example they set is to bypass civil liberties whenever possible.
If what you mean to argue is that this data gathering needed to be done under court supervision, well, it was. A subpoena is the type of court supervision process that is applicable in this case. What the subpoena means is that an attorney got a court order compelling a party to provide evidence. Warrants are also issued by the courts, but they do something different: They permit law enforcement officials (not attorn…
"a law called the Stored Communications Act allows authorities to seek data like this without a search warrant"