the nation, indeed the world, from the oval office right at the top of the hour. the president set to take the lectern in a rare address from the oval office, only the third time he's done an oval office primetime address. jake, this decision that the president made to do it on a sunday night in primetime underscoring his desire to reassure the american people he's on top of this crisis with isis and he's going to fulfill that promise to destroy it. >> yeah, to reassure as many americans as he can with the widest possible audience reaching into every home watching television on a sunday night which is a big night for television, and also to convey with a script what he wants to and and not speak extemporaneously, not speak off the cuff, convey the fact this is is not going to be a threat to the united states in any major way, that isis will be defeated and i have to say one other thing we're going to be listening for tonight is how much does he differentiate