Luntz: Paul Ryan Not Endorsing Trump ‘a Signal ... He Has Some Work To Do’

LUNTZ: "The fact that Paul Ryan did not give his endorsement is a signal to Donald Trump that he has some work to do. However, if they end up not working together, I can promise you not just a Democratic president, but a Democratic Senate and I'll say it here this morning, that if they continue to argue, if they continue to fight, you can even see a Democratic House."