volker will also appear on tuesday. >> kurt volker, let's remember, is a former career foreign service officer. kurt volker knew what normal foreign policy looks like. >> reporter: the week's final witness, fiona hill, is expected to describe what she saw as a nightmare scenario. private interests driving u.s. policy. where do you think everybody needs to be at the end of next week? >> i think democrats need to be in a position where they can say we are confident in this case, and i think the republicans just need to be at a place of either there's doubt about this case, there's doubt about whether it's true, or maybe it happened, but it's not serious enough to merit impeachment. >> reporter: high stakes heading into a potentially explosive week of testimony. >> we are adjourned. >> all right. our thanks to erica hill and thanks to you for watching. this is life with lisa ling is next.