Meanwhile, Obama has defended his decision to intervene in Libya, saying the mission is in support of an "international mandate" with a limited, humanitarian scope. The president has also said the U.S. military would only be actively involved for "days, not weeks" before other allied partners take on a leading role.
But Sen. Richard Lugar of Indiana, the top Republican on the Senate Foreign Relations Committee, and many of his peers say regardless of the president's intentions, the costs to taxpayers -- and potentially in American lives -- coupled with an uncertain outcome make the military intervention unwise.
"It's a strange time in which almost all of our congressional days are spent talking about budget, deficits, outrageous problems. And yet same time, all of this passes -- which is a very expensive operation even in a limited way, always is," Lugar said last week.