Opponents of the nuclear deal with Iran - an initiative led by US President Barack Obama - are simply warmongers, many liberal Americans insists.

Not only is the deal the "best one possible" and "better than the alternatives," but it is intrinsically watertight and, above all, will prevent Iran from obtaining nuclear weapons forever, Obama's supporters will likely tell you.

But how much do they actually know about the deal itself? 

Documentary-maker Ami Horowitz decided to find out - and the results speak for themselves.