“It is fair to say that the business-records provision is a part of the Patriot Act that I am extremely interested in reforming,” Wyden says. “I know a fair amount about how it’s interpreted, and I am going to keep pushing, as I have, to get more information about how the Patriot Act is being interpreted declassified. I think the public has a right to public debate about it.”

That’s why Wyden and his colleague Sen. Mark Udall offered an amendment on Tuesday to the Patriot Act reauthorization.

The amendment, first reported by Marcy Wheeler, blasts the administration for “secretly reinterpret[ing] public laws and statutes.” It would compel the Attorney General to “publicly disclose the United States Government’s official interpretation of the USA Patriot Act.” And, intriguingly, it refers to “intelligence-collection authorities” embedded in the Patriot Act that the administration briefed the Senate about in February.

Wyden says he “can’t answer” any specific questions about how the government thinks it can use the Patriot Act. That would risk revealing classified information — something Wyden considers an abuse of government secrecy. He believes the techniques themselves should stay secret, but the rationale for using their legal use under Patriot ought to be disclosed.

“I draw a sharp line between the secret interpretation of the law, which I believe is a growing problem, and protecting operations and methods in the intelligence area, which have to be protected,” he says.

For several years, two Democrats on the Senate Intelligence Committee, Senator Ron Wyden of Oregon and Senator Mark Udall of Colorado, have been cryptically warning that the government was interpreting its surveillance powers under that section of the Patriot Act in a way that would be alarming to the public if it knew about it.

“We believe most Americans would be stunned to learn the details of how these secret court opinions have interpreted Section 215 of the Patriot Act,” they wrote last year in a letter to Attorney General Eric H. Holder Jr.

They added: “As we see it, there is now a significant gap between what most Americans think the law allows and what the government secretly claims the law allows. This is a problem, because it is impossible to have an informed public debate about what the law should say when the public doesn’t know what its government thinks the law says.”