I think if Trump becomes President and it continues to get worse like this he will be the first President since Truman to use nuclear weapons. I can see him using it on Iraq and Syria. White America falls in love with him...
Not sure about nukes as I don' think trump will need them to take out isis and whatever forms in their place if he does what he claims he is going to do , but I can see him banning embedded media and basically allowing the US military to do whatever they feel is needed to win the war,so little to no rules of engagement,possibly a massive ground invasion and the troops will be there decades .He claims the oil will be taken by america, and anything else valuable to pay for it.
. He also claims he is going to replace the entire general staff with generals similar to 'patton',so basically he will bring in killers and not public relation types.
Where I think there is a risk with nukes, is with russia, and others in the region involved ,it is more than possible there will be something even worse than a shot down russian plane by turkey. You get that amount of hardware of different countries in one place it will be very lucky if there isnt a flashpoint. Especially as trump is claiming the US will strip the place it occupies of resources as payment. You have to remember who else in the region with interests,you think Putin is just going to sit idly by while trump takes all the oil and minerals the russians and the chinese want?
I think Trump is most likely to do this, but I think hiliary will do similar but maybe not as extreme.