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Carter's health crisis. joining me now, cnn's dana bash and mark preston. good evening to you both. the numbers are out now. is donald trump unstoppable? walk me through what we're seeing here? >> well, don, certainly he's doing well after that debate and the controversy that erupted soon after with his remarks about megan kelly. let's look at these numbers from the crucial state of iowa. these new orc poll numbers. look at donald trump on top at 22% and then carson at 14%, ted cruz at 8, mike huckabee at 7. now, don, what is fuelling the support for donald trump in iowa is that voters there t...

and may be in her system from the doctors to the pharmacies that provided them. sus dan candiotti has more about the funeral preparations. don, let's start with you. how are they examining those prescription drugs? >> they have subpoenaed several pharmacies and several doctors from the prescription medications found in whitney houston's hotel suite. they are doing that because they want to know exactly what was in her system. they are trying to trace the doctors and the pharmacies. one thing as they say would possibly lead to another, they are speaking to doctors here on the west coa...

"early start," i'm ashleigh banfield. >> and i'm zoraida sambolin. we are bringing you the news from "a" to "z." it's 5:00 a.m. in the east. let's get started here. >> this was a good one, guys, if you missed it. the tarmac in arizona got hot. it wasn't about the weather. it was about the president and the governor. jan brewer and barack obama getting testy on the tarmac and brewer even pointed her finger, shaking it, wagging it at the president. what was this all about? why did they have an issue and have they resolved it? >> just five days left until the florida primary. there are ...

frustrated. it's 100 and some degrees heat index outside, and i can understand people getting worked up about this sort of thing. more on politics in a moment. i want to start with a street level view of what has to be considered an emergency. justin bruno heads up the office of emergency management. he is kind enough to step outside and tell us what he has been up today. thank you for making the time and braving the heat. is your city in emergency mode right now? >> we absolutely are. we have temperatures we have never seen before. heat indexes will be 105 to 115, which are record...