British submarines fired two missiles on Qaddafi’s Tripoli compound Sunday. While the British Ministry of Defense said the compound was targeted because of its military significance, the action signaled western forces were looking beyond Qaddafi’s primary defense systems as possible targets.

House Armed Services Committee Chairman Buck McKeon, R-Calif., warned that a failure to define the political objectives “risks entrenching the United States in a humanitarian mission whose scope and duration are not known at this point and cannot be controlled by us.”

Rep. Candice Miller, R-Mich., called the decision to strike without congressional consent “troubling and unacceptable.”

“The president should immediately return home and call Congress back into session so that this action can be fully debated,” she said in a statement. Obama is currently in Latin America on a diplomatic tour.

“We have seen uprisings across the Middle East over the last few months and in many instances atrocities have been perpetrated,” Miller said. “One now must ask where this administration draws the line.”

Though Obama has called for Qaddafi to leave office, the administration insists the current use of force -- which followed the U.N. Security Council approval of a no-fly zone -- is only to stop Qaddafi from killing his own people.

U.S. Army Gen. Carter Ham said Monday that the military is not worried about “mission creep” because the mission is clear.

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