we're less than 50 minutes away from cnn's live town hall with president obama here on the campus of george mason university in virginia. we'll have much more on our special coverage in a moment. first, a lot is happening on the campaign trail tonight. we're going to show you live pictures of a donald trump campaign rally in burlington, vermont. we're watching to see if he will go there. once again, go after ted cruz over his canadian birth. it's an issue that now has democrats and fellow republicans, even, raising doubts that cruz is eligible to be president. jeff zeleny it "outfront." >> reporter: donald trump is not letting go, fanning the flames about ted cruz's citizenship. >> he's got this cloud over his head. i don't think it's going to be possible for him to do very well. >> today, trump sent a message to his rivals saying, ted, free legal advice on how to pre-empt the dems. never mind democrats, it's