WASHINGTON  In a setback for the White House, Senate Democrats on Monday put off until at least next month any decision on whether to give legal protection to the phone carriers that helped with the National Security Agency’s eavesdropping program.

The Bush administration had pushed for immediate passage of legislation to grant immunity to the phone companies as part of a broader expansion of the N.S.A.’s wiretapping authorities. But that will not happen now.

After daylong debate in the Senate on the wiretapping issue, Senator Harry Reid of Nevada, the majority leader, announced at the end of the day that there would not be time to consider the legislation this week as he had hoped. With a dozen competing amendments on the issue and an omnibus spending bill separately awaiting consideration, Mr. Reid said he believed it would be difficult to give the wiretapping issue the close consideration that it deserved this week before the Senate leaves for its Christmas recess.

“Democrats are committed to improving our nation’s intelligence laws while protecting Americans’ civil liberties,” Mr. Reid said. “We need to take the time necessary to debate a bill that does just that, rather than rushing one through the legislative process.”