samer shehata, assistant professor of arab politics at georgetown university. and steven cook, senior fellow for middle eastern studies at the council on foreign relations. 6-thank you all three for being here. i just want to report to you and our audience, we've just learned that vice president biden has been on the phone in the last hour or so calling the new egyptian vice president urging restraint on both sides. the wires are reporting the white house is saying that the egyptian government is responsible for ensuring peaceful demonstrations don't lead to violence. now, samer shehata, what is the level of concern here in the united states about where things are headed? >> well, i think people are very concerned, both in egypt and the united states. as the report mentioned, tomorrow is supposed to be the day. as far as the protestors are concerned, all different types of protestors, from the april 6 movement to the muslim brotherhood. and they're going to try to get to cairo and get to tahrir, liberation square, in large numbers. and they're hoping that will