tunisha has unleashed a political tsunami.it's richles are still being felt right -- right across the arab world. >> while developments in egypt are being watched particularly closely in washington, it's a sticky situation for the white house. egypt is a key ally. the bbc's andrea north has more on the by lomatic stakes. >> calls for the egyptian leader to go have come to president obama's doorstep, keeping on the pressure for the u.s. administration to back the protests. >> i want president obama to pick up the phone and tell president mubarak to leave now. >> we are here to say to mubarak, five hours, you have to go. game over. >> the white house has said it's reviewing u.s. aid to egypt but it's still struggling to find the best response. >> it's cheer -- clear what these demonstrators want but unlikely the americans are going to abandon their longtime ally so quickly. while the obama administration wants to be seen as supporting democracy, it's a tricky situation how to respond. >> there was a slightly tougher line from pr