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But shortly after the hearing, in a Kafkaesque trick, Mr. Coats’ office told reporters that he had answered a different question than the one that was asked. And then the DNI stated that the answer to the original question was classified.

We’ve been down this road before. Both Democratic and Republican administrations have hidden from Congress and the American people what they believe surveillance laws – public laws passed by the representatives of the people – actually mean. We’ve called this practice “secret law.”

Each time this happens, the government further damages the public trust necessary for the government, and in particular intelligence agencies, to function. One need look no further than when the massive surveillance dragnet of millions of Americans’ phone records was revealed — which was based on the government’s secret interpretation of another provision of FISA. Americans were rightly outraged and, eventually, reformers succeeded in ending that overreaching program.

Likewise, FISA absolutely needs to be reformed and made to comply with the Constitution. The data collected under Section 702 is gathered under an almost limitless standard. We tolerate that standard because the targets are not U.S. citizens and are not located on American soil, even though they may be communicating with Americans. A constitutional problem arises, however, when we allow the Intelligence Community and domestic law enforcement to search and use the data collected on Americans without constitutional protections. Reform of FISA needs to prevent these searches and the use of this data in domestic crime. Without these reforms, the program does not comply with the Fourth Amendment.

Such a change is especially important because Director Coats, at the aforementioned June hearing, announced that he would not even provide an estimate of the number of Americans’ communications that are being swept up under the provision of the surveillance law we are seeking to reform. That is a 180-degree reversal of the government’s previous position; as recently as April, the administration promised to release information about this collection.

Deputy Attorney General Rod Rosenstein looks through his notes at the hearing in June. Alex Brandon / AP file

If neither Congress nor the public knows how many Americans’ communications are being searched, we can’t know the full impact on Americans’ liberty caused by these warrantless back-door searches.

Congress also needs to write into law a prohibition on the recently discontinued practice of collecting communications that are not to or from a foreign target, but are merely about a foreign target. This form of collection could include communications to and from Americans who are under no suspicion at all. (In yet another case of a secret interpretation of law, the so-called “abouts” collection was never knowingly authorized by Congress in the first place.)

There are other necessary reforms to Section 702 of this surveillance law, including strengthening the oversight of the Foreign Intelligence Surveillance Court and the Privacy and Civil Liberties Oversight Board, requiring more transparency, and making sure that the vast surveillance powers provided to the executive branch are not misused. Finally, Congress may need to legislate on the question that the Director of National Intelligence has refused to answer regarding wholly domestic communications.

We intend to fight tooth and nail for these and other reforms, which we expect will have strong bipartisan support. But the problem of secret interpretations of the law hangs like a cloud over the whole legislative process.

The Constitution vests in Congress the exclusive power to make laws and to provide oversight over their execution. There will always be programs and operations that are conducted in secret, as long as they follow the law. But if the government won’t tell the public what it thinks the law means, oversight no longer works. If the government expects Congress to pass laws with secret meanings, and Congress complies, then the legislative process is no longer functioning. And when the public has no way to hold its representatives accountable, then the whole system is broken.