The 'FISA Amendments Act' would gut the oversight system established by the Foreign Intelligence Surveillance Act of 1978, which subjected domestic spying to review by a special intelligence court.
Like any extraordinary power, surveillance provides temptations for abuse, such as tracking political opponents and journalists.
There is not much of a bureaucratic leap, if history is any guide, between a seemingly benign call for 'continuous situational awareness' and the onset of a covert and illegal campaign of domestic surveillance.