WASHINGTON - US President Barack Obama has asked two senior Republican senators to travel to Egypt to meet with its military leaders and the opposition, as Cairo's allies struggle with how to address the turmoil convulsing the country.Senator John McCain and Lindsey Graham, both members of the Senate Armed Services Committee, hope to travel to Egypt next week, Graham said on Tuesday."The president reached out to us, and I said obviously I'd be glad to go," Graham told reporters outside the Senate. "We want to deliver a unified message that killing the opposition is becoming more and more like a coup" and to encourage the military to move toward holding elections.He said specifics of the trip, including with whom he and McCain would meet, had not yet been worked out.