The U.S. agreed to NATO’s request for a 48-hour extension of American participation in coalition airstrikes against targets in Libya and U.S. lawmakers cautioned on Sunday that the allies need to know more about the rebels fighting Muammar Qadhafi’s forces before providing them with weapons.

Two weeks into the assault on Qadhafi, Republican lawmakers expressed concern that a stalemate could leave him in control of portions of Libya and with access to stockpiles of chemical weapons.

The U.S. is shifting the combat role to Britain, France and other NATO allies, but American air power is still in demand. Air Force AC-130 gunships and A-10 Thunderbolts and Marine Corps AV-8B Harriers will continue to attack Qadhafi’s troops and other sites through Monday evening. These aircraft are among the most precise in the American arsenal.

After Saturday, no U.S. combat aircraft were to fly strike missions over Libya unless NATO officials specifically asked and authorities in Washington gave their approval. NATO assumed full control last week from the U.S.-led international force for all aspects of the operation in Libya as authorized by U.N. resolutions that include an arms embargo, enforcing the no-fly zone, and protecting civilians from Qadhafi’s forces.

In an emailed statement, NATO spokeswoman Oana Lungescu said on Sunday that “poor weather conditions over the last few days” were the reason the alliance made the request. She would not elaborate. “This is a short-term extension which expires on Monday,” she said.

A senior U.S. military official said heavy cloud cover over Libya late last week curtailed allied airstrikes. Qadhafi took advantage of the lull, pushing east into the port cities of Ras Lanouf and Brega, the official said on condition of anonymity to discuss sensitive military planning. The 48-hour extension is intended to roll back the progress made by Qadhafi’s army, the official said.

A decision yet to be made by the Obama administration is whether to arm the rebels with the firepower they need to take and hold ground against Qadhafi’s forces.

Rep. Mike Rogers, the Republican chairman of the House Intelligence Committee, said there may be strains of al-Qaeda within the rebel ranks and that the coalition should proceed with caution before arming them.

“We know they’re against Muammar Qadhafi remaining in power, but we don’t know what they are for,” Rogers said.

Senate Majority Leader Harry Reid advocated a “wait and see” approach to giving the opposition forces weapons.

“I think at this stage we really don’t know who the leaders of this rebel group are,” said Reid, a Democrat.

But Rogers also warned that if there were a stalemate in Libya, a cornered Qadhafi might resort to extreme measures against the opposition forces, such as the use of chemical weapons. Rogers said he has been to Libya and seen Qadhafi’s chemical weapons.

“I think you have to worry that he’s a terrorist threat,” Rogers said.

Republican Sen. Lindsey Graham said the coalition needs to take the air war to Libya’s capital where Qadhafi and his inner circle are located. Striking targets in Tripoli will further fracture Qadhafi’s government and push the Libyan leader from power, he said.

“The way to end this war is to have Qadhafi’s inner circle to crack,” Graham said. “The way to get his inner circle to crack is to go after them directly.”

Like Rogers, Graham said he’s concerned over the prospect of a stalemate in Libya.

Allied military operations against Qadhafi’s forces began March 19 with missiles and bombs targeting Libya’s air defences, communications networks, and ground forces. Obama has ruled out the use of U.S. ground troops in Libya. But the opposition lacks the proper organization and equipment to push back Qadhafi’s army on its own.

Sen. John McCain, the top Republican on the Senate Armed Services Committee, said failing to arm the rebels could allow Qadhafi to maintain control over large swaths of Libya.

“We are concerned that regional support will waver if Western forces are perceived as presiding over a military deadlock,” McCain and Sen. Joe Lieberman, a Connecticut independent, wrote Friday in The Wall Street Journal. “We cannot allow Qadhafi to consolidate his grip over part of the country and settle in for the long haul.”

Navy Adm. Mike Mullen, the chairman of the Joint Chiefs of Staff, said in congressional testimony on Thursday that as few as 1,000 among the rebels are former members of Qadhafi’s military.

The rest are simply “guys with guns,” said James Dubik, a retired Army three-star general who says they need American or NATO advisers and trainers to be effective. “They need help,” Dubik wrote in an assessment for the Institute for the Study of War, a think tank in Washington.

In an interview taped on Sunday for ABC’s “Good Morning America,” former President Bill Clinton said he “wouldn’t shut the door” to arming the Libyan rebels. But Clinton, husband of Secretary of State Hillary Clinton, was quick to emphasize that he was not speaking for the Obama administration.

Rogers appeared Sunday on NBC’s “Meet the Press.” Reid and Graham appeared on CBS’s “Face The Nation.”

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