"Financial institutions that operate in the United States are required by law to file reports of "suspicious customer activity," such as large money transfers or unusually structured bank accounts, to Treasury's Financial Crimes Enforcement Network (FinCEN)."
I find it a little bit hyperbolic that people are calling the end of the republic at the proposal that intelligence agencies have broader access to financial records they already have access to anyway--financial records that only cover certain kinds of suspicious transactions.