The president stopped in Saudi Arabia, where 79 percent of residents view him favorably, on Wednesday. But in Cairo tomorrow, he'll address a skeptical audience of 1.4 billion Muslims.
Many see his decision to deliver a major speech in Egypt as a nod of tacit support for the regime's authoritarian rule.
A US Navy-chartered cargo ship fired on a small Egyptian boat Monday night. Egypt says at least one man was killed, while the US initially reported no casualties.