will probably end up eventually dropping out. you have to really think about who has momentum and buttigieg and warren in particular have a lot of momentum. and as the field narrows a little bit more, they might be able to close in on biden's lead. i don't really see sanders being able to close in much because he's just dropping so much. he's gone down 9 percentage points. so i think it's really going to be -- end up being a three-way race between biden, warren and buttigieg. >> and at this point, the u.s. president focussing in on that key issue of immigration. that seems to be helping him with his base. again, we're getting close to 2020. not there but getting close. democrats in the meantime. i want to transition to this issue of impeachment because candidates running for president are talking about it. certainly they're talking about it in the house, but they seem divided in the house, natasha, on whether to pursue impeachment inquiries against the president