Unless something changes, Congress will once again be forced to vote on an expiring surveillance law — while being kept in the dark about what it actually does.

Since the Snowden revelations, Congress has been debating Section 702 of FISA, a surveillance law that is being used by the government to copy and search millions of Americans’ overseas communications. Section 702 is set to expire in 2017 — but the intelligence agencies have already made clear that they oppose certain efforts to reform the law. They have also resisted releasing critical information about how the law impacts Americans.