So, if the ACLU was able to prove that they were unfairly targeted under this program, would they be able to sue the members of the House Select Committe on Intelligence, for example, for failing to provide oversight? For example, could they take Nancy Pelosi to court for her role, or negligence, in the case?
The short answer to your questions is no. Unfortunately. :) Congress can demand briefings about the program, withhold funding for the program if the information is not forthcoming, enact laws to curb even potential abuses, and several other things.