As NPR's Dina Temple-Raston reported earlier today, the senators had expressed concern about a "secret interpretation of the Patriot Act that would stun the American people."
In the letter, obtained by NPR's Carrie Johnson, Weich explains in broad terms how the government collects information using section 215 of the Patriot Act, which expanded the powers of the Foreign Intelligence Surveillance Court after the terrorist attacks of Sept. 11, 2001. And he makes two main points: Congress had detailed knowledge of the classified uses of section 215 and that it still reauthorized the statute and two other provisions of the Patriot Act by overwhelming margins in May 2011.
"Against this backdrop, we do not believe the Executive Branch is operating pursuant to 'secret law' or 'secret opinions of the Department of Justice,' " Weich writes. "Rather, the Intelligence Community is conducting court-authorized intelligence activities pursuant to a public statute, with the knowledge and oversight of Congress and the Intelligence Committees of both Houses. There is also extensive oversight by the Executive Branch, including the Department of Justice and relevant agency General Counsels and Inspectors General, as well as annual and semi-annual reports to Congress as required by law."
Weich says that section 215 of the Patriot Act allows the federal government to ask the Foreign Intelligence Surveillance Court (FISA) for permission to collect any tangible things in connection to "an authorized investigation to protect against international terrorism or clandestine intelligence activities."
"In order to issue an order, the FISA Court must determine that there are reasonable grounds to believe that: (1) the tangible things sought are relevant to an authorized national security investigation, other than a threat assessment; (2) the investigation is being conducted under Guidelines approved by the Attorney General under Executive Order 12333; and (3) if a U.S. person is the subject of the investigation, the investigation is not being conducted solely on the basis of First Amendment protected activities."
The law also stipulates that the FISA court is only allowed to OK the production of records that can normally be obtained with a grand jury subpoena.
Weich goes on to explain that this threshold is fairly broad can include records related to lawful activities by U.S. citizens. He writes:
"Grand jury subpoenas do not require the approval of a court but rather may be obtained with the approval of a single prosecutor and may request a wide variety of records; the government is not required to make any showing of relevance to a court before issuing such a subpoena. The records obtained pursuant to a grand jury subpoena may concern the lawful activities of U.S. citizens if those records are relevant to an investigation. A motion to quash a grand jury subpoena will be denied unless there is 'no reasonable possibility' that the category of information the government seeks will produce information relevant to the general subject of the grand jury's investigation."
We've embedded the full letter below: