Early last month, Director of National Intelligence Dan CoatsDan CoatsGranting NSA permanent bulk surveillance authority would be a mistake Sessions, deputy AG to tour Guantanamo Bay prison The Memo: GOP pushes Trump to curb Mueller attacks MOREreneged on a promisethat the National Security Agency would provide an estimate of just how many Americans have seen their communications collected under Section 702 of the Foreign Intelligence Surveillance Act. It was the same broken promise made to Congress by his predecessor, James Clapper.

Indeed, for the past six years, the NSA has flummoxed congressional oversight with its reluctance to give lawmakers this kind of hard data. And yet, despite this pattern of obfuscation of promising transparency and then dialing back said promisesCongress is now debating a bill that would give immense power to that same agency.

The legislation, which has left many privacy advocates aghast, comes in the form ofa proposalby Sen. Tom CottonTom CottonOvernight Finance: GOP goes after arbitration rule | Bill allocates .6B for Trump border wall | Fed officials cautious on rate hike | McConnell aiming for debt vote before August recess Overnight Regulation: GOP senator aims to repeal arbitration rule | Feds to rethink fuel efficiency fines | EPA moves to roll back restrictions on Alaska mine Lawmakers press Sessions over online gambling MORE (R-Ark.) for a so-called "clean" reauthorization that would leave the current Section 702 intact. Of course, it isn't actually clean, in that Cotton's bill would remove the sunset provision that forces the program to expireDec. 31unless Congress explicitly re-authorizes it. In other words, even as Coats now deems it infeasible that the NSA will ever tell Congress how many Americans have been surveilled under Section 702a number that likely would shock the conscienceCotton wants to ensure 702 is never up for debate again.

Coatsexplainedto the Senate Intelligence Committee last month that the NSA ended about collectionthat is, the practice of collecting digital communications in which a foreign target is mentioned, but is not the sender or recipientdue to technical limitations on the agency's ability to protect wholly domestic communications. However, he didnt rule out resuming about collection if the agency discovers a technological fix. Paul Morris, deputy general counsel for operation at the NSA,toldthe Senate Judiciary Committee several weeks later they might decide to come back to it anytime. NSA representatives also havewarnedthey would oppose a permanent legislative ban on this type of collection.

A recurring theme from law-enforcement and intelligence community representatives in recent House and Senate hearings is that technological developments can drastically change how government conducts surveillance. But even as agency representatives tell us how rapidly surveillance methods change, a permanent reauthorization of current surveillance methods presumes that future revolutions in technology won't affect Americans relative privacy. Not long ago, few could have conceived of an email or that it would become a major tool of communication.

If the intelligence community decides to resume about collection, a method proven to have violated Americans rights in the past, Congresss oversight role should not be hamstrung by a permanent reauthorization. Eliminating the law's sunset provision would limit Congress's ability to revisit these questions and examine exactly how surveillance methods might change in the future. With far-reaching technological change always looming, Congress must periodically revisit the legal authority behind these intelligence tools both to ensure they remain effective at protecting the nation, and that adapting an old law to new technologies doesnt open the door to abuse.

Establishing a sunset for the program shouldnt be anathema to those who are primarily concerned with national security. To the contrary, it is the best way to ensure the program remains viable and accomplishes the purpose of keeping Americans safe. Permanent reauthorization would limit any attempts to modify surveillance. It also increases the risk of another leak and public outcry, which easily leads to a knee-jerk reaction. Intelligence agencies could shy away from reasonable and effective procedures, absent any obligation to report to congressional oversight.

A kid genius working from a basement today may change the way our systems work tomorrow, crippling the effectiveness of Section 702 or opening the door to abuse. Giving law enforcement and the intelligence community's great power without built in opportunities to revisit that authorization would be a disservice to the security and civil rights of the American people. In the end, the most critical reform to Section 702 might already be part of thestatus quo.

Arthur Rizer(@ArthurRizer)is the national security and justice policy director at the R Street Institute, and Ashkhen Kazaryan (@Ashkhen) is an affiliated fellow at the non-profit TechFreedom.

The views expressed by contributors are their own and are not the views of The Hill.

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Granting NSA permanent bulk surveillance authority would be a mistake - The Hill (blog)