and university of washington pulmonologist is also an msnbc medical contributor. shannon, i want to start with you. it is a scary thought that the president of the united states, a week after his diagnosis is going to be back out on the campaign trail. what does that look like if he is going out? is he going to be coming into contact with people? >> well, we don't know, obviously, katy, what that looks like at the moment. the president said last night he was thinking of doing a rally on saturday. it's friday at 2:00 now. there are no indications that that is happening. nothing has been announced. there is no location. reporters haven't been notified about anything. saturday seems to be off the table. our reporting does indicate though that the president is serious about this idea of doing an event on thursday, which was supposed to be the day for the debate. and it could serve as some counterprogramming to a town hall that joe biden is now planning on doing. so, rather than ceding that night to joe biden, trying to do