that they clearly don t want. they think they are making advances toward tripoli and they want another week, two weeks of intense air strikes. and if they have that, the rebels say, they could reach tripoli. richard engel, nbc news, bengha benghazi. americans will have a chance to hear president obama himself talk about the u.s. mission in libya. that s tomorrow night in a prime time speech to the nation. on meet the press this morning, defense secretary robert gates spoke to david gregory about how long this mission might last. i think we have to a large extent completed the mill mare mission in terms of getting it set up. now the no-fly zone and even the humanitarian side will have to be sustained for some period of time. nbc s mike viquiera joins us live from the white house. mike, i want a better sense of what else we re hear fing from e administration about the situation in labia. what are they telling us we can expect to hear last night? reporter: beginning yesterday wi