The Patriot Act waters down the Fourth amendment by expanding the federal government’s ability to use wiretaps without judicial oversight. The requirement of a search warrant and probable cause strikes a balance between effective law enforcement and civil liberties. Any attempt to dilute the warrant requirement threatens innocent citizens with a loss of their liberty. This is particularly true of provisions that allow for issuance of nationwide search warrants that are not specific to any given location, nor subject to any local judicial oversight.
The Act makes it far easier for the government to monitor your internet usage by adopting a lower standard than probable cause for intercepting e-mails and internet communications.