U.S. President Barack Obama is facing growing criticism at home and abroad over whether the military campaign in Libya is the wrong policy - or the right policy at the wrong time.

Obama, on a five-day tour of Latin America, defended his administration's muscular approach in Libya, saying it was "very easy to square our military actions and our stated policies."

Speaking in Chile, Obama said U.S. military forces would focus on the goal approved by the U.N. Security Council last week, preventing longtime leader Moammar Gadhafi's army from attacking Libyan civilians. But he also reiterated that Gadhafi should be removed.

He said the United States also would use nonmilitary means, including economic sanctions and an arms embargo, to try to end Gadhafi’s four-decade rule.

Obama sent a letter to congressional leaders Monday attempting to assure them that the administration was seeking a "rapid but responsible transition" of military command to other members of the United Nations-backed coalition. The letter followed complaints that he had failed to consult Congress before launching military action.

Political analysts say Obama could benefit if Gadhafi is quickly ousted, or if there is another quick and relatively bloodless resolution. But if the conflict becomes a stalemate, criticism is likely to mount.

Complaints have already started to escalate. Some early advocates of military intervention, including Sen. John McCain (R-Ariz.), said Obama may have waited too long to help the opposition in Libya.

A contingent of liberal Democrats, normally allied with the president, condemned the use of military force. Some conservatives, as well as foreign policy experts, said Libya is not a vital U.S. interest, Los Angeles Times reported.