he is now the third republican to challenge trump. former illinois congressman joe walsh and former massachusetts governor bill weld are also in the race. let's discuss with cnn political analyst and congressional reporter for "the washington pos post", karoun demirjian, and national politics reporter for yahoo! news, brittany shepard. ladies, good to have both of you with us. karoun, the fact that walsh, shepard, and now sandford have jumped into this race, does that mean they see some weakness in the trump presidency? >> i think it's that there's a subset that's not in step with president trump. and you're seeing that frustration from that wing of the party that is, you know, the more traditional people who have been around for a long time for the most part. putting some -- these candidates putting their name out to say that they will challenge trump for the party nomination. now, how significant of a challenge that any one of them