The United States now has about 50 soldiers in Pakistan. Any expanded operations using C.I.A. operatives or Special Operations forces, like the Navy Seals, would be small and tailored to specific missions, military officials said.

Defense Secretary Robert M. Gates, who was on vacation last week and did not attend the White House meeting, said in late December that “Al Qaeda right now seems to have turned its face toward Pakistan and attacks on the Pakistani government and Pakistani people.”

In the past, the administration has largely stayed out of the tribal areas, in part for fear that exposure of any American-led operations there would so embarrass the Musharraf government that it could further empower his critics, who have declared he was too close to Washington.

Even now, officials say, some American diplomats and military officials, as well as outside experts, argue that American-led military operations on the Pakistani side of the border with Afghanistan could result in a tremendous backlash and ultimately do more harm than good. That is particularly true, they say, if Americans were captured or killed in the territory.

In part, the White House discussions may be driven by a desire for another effort to capture or kill Osama bin Laden and his deputy, Ayman al-Zawahri. Currently, C.I.A. operatives and Special Operations forces have limited authority to conduct counterterrorism missions in Pakistan based on specific intelligence about the whereabouts of those two men, who have eluded the Bush administration for more than six years, or of other members of their terrorist organization, Al Qaeda, hiding in or near the tribal areas.

The C.I.A. has launched missiles from Predator aircraft in the tribal areas several times, with varying degrees of success. Intelligence officials said they believed that in January 2006 an airstrike narrowly missed killing Mr. Zawahri, who had attended a dinner in Damadola, a Pakistani village. But that apparently was the last real evidence American officials had about the whereabouts of their chief targets.

Image Al Qaeda and the Taliban use the tribal areas as a base. Credit... The New York Times

Critics said more direct American military action would be ineffective, anger the Pakistani Army and increase support for the militants. “I’m not arguing that you leave Al Qaeda and the Taliban unmolested, but I’d be very, very cautious about approaches that could play into hands of enemies and be counterproductive,” said Bruce Hoffman, a terrorism expert at Georgetown University. Some American diplomats and military officials have also issued strong warnings against expanded direct American action, officials said.