the presidential race wednesday. in elkhart, indiana, the first city he visited as president, he participated in the town hall with pbs news hour. he gave his thoughts on the democratic race. >> i think that there's been a healthy debate in the democratic party. and it's almost over. you know, we've got -- on tuesday, you'll have some big states, california and new jersey where the votes will take place. i think we'll probably have a pretty good sense next week of who the nominee will be. >> reporter: he also talked about the trump phenomenon. >> a lot of times it's easy for people to say, you know what, if we deport all of the immigrants and build a wall or if we cut off trade with china or if we do "x" or "y" or "z" suddenly everything will feel secure. >> why don't you mention donald