priorities from the white house perspective. what are they, going into the summit? and how will the white house measure progress? >> reporter: they're not bracing for a big breakthrough. that's absolutely correct. so essentially, one thing the u.s. and russian presidents agree on is that relations are at an all-time low point. the white house views this as, anything that can raise the bar ever so slightly or incrementally will be viewed as progress. the president has a long list of things he plans to confront putin about, and they're hoping he can get to all of them. we're learning a little bit more about how that could go. they could meet for as long as four or five hours tomorrow, at a swiss village overlooking lake