In fact he was the only Senator to vote against the PATRIOT Act in the first place. And, at that time, he gave a speech in which he accurately predicted how the NSA would abuse the PATRIOT Act:

„And under this new provisions all business records can be compelled, including those containing sensitive personal information like medical records from hospitals or doctors, or educational records, or records of what books someone has taken out of the library. This is an enormous expansion of authority, under a law that provides only minimal judicial supervision.

Under this provision, the government can apparently go on a fishing expedition and collect information on virtually anyone.“