From the AP:

Three telecommunications companies have declined to tell Congress whether they gave U.S. intelligence agencies access to Americans' phone and computer records without court orders, citing White House objections and national security.

Director of National Intelligence Mike McConnell "formally invoked the state secrets privilege to prevent AT&T from either confirming or denying" any details about intelligence programs, AT&T general counsel Wayne Watts wrote in a letter to the House Energy and Commerce Committee.

Qwest and Verizon also declined to answer, saying the federal government has prohibited them from providing information, discussing or referring to any classified intelligence activities.

. . .

The White House declined to comment on the matter Monday.