Federal applications for a special US court to authorise secret surveillance rose sharply after the September 11, 2001, attacks, and the panel required changes to the requests at an even greater rate, government documents show.
President George W. Bush acknowledged this month he had secretly ordered the National Security Agency to eavesdrop on the international phone conversations and e-mail of Americans suspected of links to terrorists without approval from the Foreign Intelligence Surveillance Court.
The domestic spying order has set off a furious debate over whether the war on terrorism gives Bush a blank check when it comes to civil liberties and whether the president, in fact, broke the law.
The Justice Department's reports to the US Congress on the surveillance court's activities show the Bush administration made 5,645 applications for electronic surveillance and physical searches from 2001 through 2004, the most recent year for which figures are available. In the previous four years, the court received a total of 3,436.
The 11-judge panel modified 179 of the Bush administration's requests. By contrast, only one was modified in the preceding four years. The court has reportedly handled almost 20,000 applications since it was set up and has rejected only a handful. Reasons for the modifications were not stated and could range from minor alterations to more substantive changes.
The highly classified court was set up by the 1978 Foreign Intelligence Surveillance Act, or FISA, in the wake of Cold War spy fears and President Richard Nixon's misuse of US intelligence agencies to spy on the anti-Vietnam War movement and other political dissidents.
The Washington-based Council on American-Islamic Relations has filed a Freedom of Information request with federal agencies seeking government records relating to Bush's executive orders authorising surveillance of Americans.
The group said on Tuesday it also filed a similar request with the Justice and Energy Departments for information on the secret radiation monitoring of Muslim sites in six US cities, first reported by US News and World Report. The magazine reported last week that more than 100 sites, including private homes, were monitored without court approval as required by FISA.
"We are concerned that, under this secretive programme, our government has overstepped constitutional bounds by intruding on private property without any probable cause or valid court orders," CAIR's national legal director, Arsalan Iftikhar, said in a statement.
Bush has said FISA was intended for "long-term monitoring" and that the government after September 11 needed to move "faster and quicker" to protect Americans.
Bush said he had reauthorize the domestic spying programme more than 30 times since the September 11 attacks and would continue to do so.
In Crawford, Texas, where Bush is spending the holidays, his spokesman, Trent Duffy, defended what he called a "limited programme."
"This is not about monitoring phone calls designed to arrange Little League practice or what to bring to a potluck dinner," he told reporters. "These are designed to monitor calls from very bad people to very bad people who have a history of blowing up commuter trains, weddings, and churches."
After some of the FISA judges expressed concern about the legality of the domestic spying programme, the Bush administration agreed to provide them with a classified briefing, probably early next month.