Republican U.S. Senator John McCain, a former presidential candidate and one of the loudest voices calling for military aid to the Syrian opposition, met with some of the rebels during a surprise visit to the war-torn country on Monday, his spokesman said.
Spokesman Brian Rogers confirmed McCain's meeting with the rebels, but declined to give any details about the visit, which came a week after a U.S. Senate panel voted overwhelmingly to send weapons to forces fighting the Syrian government.
General Salem Idris, who leads the Supreme Military Council of the Free Syrian Army, told the Daily Beast in an interview that McCain's visit came at a critical time for the rebels, who have stepped up their calls for U.S. support, including heavy weapons, creation of a no-fly zone and air strikes.
"The visit of Senator McCain to Syria is very important and very useful especially at this time," the publication quoted Idris as saying. "We need American help to have change on the ground; we are now in a very critical situation."
McCain entered Syria from the country's border with Turkey and stayed there for several hours before returning to Turkey, according to the report. It said McCain met with assembled leaders of Free Syrian Army units in both Turkey and Syria.
McCain, who made a similar visit to Libya early in that conflict, called for U.S. military aid to the forces opposing Syrian President Bashar al-Assad in a Time magazine column earlier this month, arguing that the cost of inaction outweighed the cost of intervention.
"The U.S. does not have to act alone, put boots on the ground or destroy every Syrian air-defense system to make a difference," McCain wrote, arguing that training for the rebels, targeted air strikes and the stationing of Patriot missiles just across the border would help change the current dynamic.
McCain recalled his support for a U.S.-led effort under then President Bill Clinton to stop mass atrocities in Bosnia two decades ago and said the United States was uniquely positioned to help in Syria as well.
"Taking these steps would save innocent lives, give the moderate opposition a better chance to succeed and eventually provide security and responsible governance in Syria after Assad," he wrote in the Time magazine article. "However, the longer we wait, the worse the situation gets."
The Obama administration has increased humanitarian aid, but has stopped short of providing lethal assistance to Syrian opposition forces. President Barack Obama has resisted pressure to deepen U.S. involvement in Syria's civil war, wary of getting U.S. forces embroiled in another ground war just as American troops are preparing to withdraw from Afghanistan.
The Pentagon remains concerned about Assad's ability to shoot down enemy aircraft with surface-to-air missiles, particularly in a sustained campaign.
The Pentagon estimates than Syria has five times more air defenses than those that existed in Libya, where the United States helped establish a no-fly zone in 2011. They are also far more densely packed and sophisticated.
In Libya, there were no Western casualties. But the risks are higher in Syria and it's unclear whether the war-weary American public - exhausted by the conflicts in Iraq and Afghanistan - would tolerate U.S. casualties.