after he made a sudden, unannounced, unscheduled visit to walter reed medical center over the weekend. now, the white house says it was regular testing as part of his annual physical, but a source tells cnn the visit did not follow the usual protocol for a routine presidential exam. dr. sanjay gupta is live with us. so sanjay, what do you see here? >> well, i mean, the fact it did not fit protocol, follow protocol not only from previous administrations but from this administration. in the past the white house did alert people that the president was going to have a physical exam. it was planned. as you might imagine, it's a big deal for the president to show up at the hospital. doesn't sound like everyone at the hospital knew about this. so there were several protocols that were broken here. also, this y that he went in for the first phase of a physical exam, that's typically -- very typically not how it's done. in fact, many of the things that they said he had done at walter