In June 2013, Mueller defended NSA surveillance programs in testimony before a House Judiciary Committee hearing.[46] He said that surveillance programs could have "derailed" the September 11 attacks.[47][48] Congressman John Conyers disagreed: "I am not persuaded that that makes it OK to collect every call."[48] Mueller also testified that the government’s surveillance programs complied "in full with U.S. law and with basic rights guaranteed under the Constitution."[49] He said that "We are taking all necessary steps to hold [Edward Snowden] responsible for these disclosures."[50]