what is driving this rally and when will the almost-free ride end? hello everyone. welcome to "the lead." i'm jake tapper. start with our politics lead, isis terrorists, they are evil, maniacal, remorseless, twisted murderers. they're also quite good at propaganda. and hillary clinton says donald trump has provided isis with plenty of new material. national security experts they do tend to agree with that estimation, but then clinton on saturday night went far beyond that saying, on the debate stage, that isis recruiters have been affirmatively going around showing videos of trump to inspire people to join their terrorist cause. that is a claim that no one can verify. and that fact has trump demanding that the democratic front-runner apologize. cnn senior washington correspondent jeff zeleny is here with me. jeff, where does the clinton campaign say this claim came