I understand that Clancy has not been pleased with the deviations in other movies (hence the delay on this one). Needless to say, I won't go see this crap, it's utter implausible. The book was very plausible.
P.S. The Arab/Muslim terrorists used commy East German Nuke scientists to rebuild the fission bomb and convert it into a fusion (Hydrogen) bomb but then goofed up by killing them before the deuterium was purified. The enraged POTUS does order a retaliatory strike on Iran but cooler heads (i.e. Ryan's (head of CIA)) prevail. Saudi publicly beheads the arch villian in the end.