He is not telling me, and it is risky to attempt to predict the actions of individuals, but Trump has a long history of picking up hundred dollar bills lying on the pavement that everyone else refuses to pick up.
And for the defeat of Isis, the hundred dollar bill lying on the pavement is:
Islamic State’s claim to be the Caliphate rests on it being a state, on it controlling territory, a capital, a uniformed army with proper chain of command, and wealth. If you are hiding in a cave on a mountainside, you cannot be the Caliph. So, to kill Islamic State, make it stop being a state. As yet another mere terrorist organization, has less appeal.
So cut a deal with Putin and Assad for a joint attack on the capital of Islamic State. Follow Assad’s brutal example by leafleting the place telling everyone to flee or die. Give them the opportunity to flee. Then kill everyone who has not fled. Level the capital to the ground. Utterly flatten everything. What the bombs leave standing roll over with mine clearing tanks followed by bulldozer tanks. Rebuild under the control of Sunnis who are in Assad’s pocket. Make sure any Sunnis not in his pocket are dead or fled, preferably dead. Repopulate with cooperative Sunnis so that your genocide does not look too much like genocide.
Islamic State will probably still be around as a terrorist organization, but they are, or recently were, committed to realist version of Islam. If they are not a state any more, will not call themselves “Islamic State”, will not claim their leader is the rightful Caliph, merely the future Caliph.
He is keeping the plan secret, because he needs to cut a deal and it will make it hard to bargain if he is precommitted to getting the deal.
Of course the left is going to scream genocide, but their humanitarian intervention in Syria was predicated on Alawites being genocided and Christians being expelled to Lebanon, and their humanitarian intervention in the Congo predictably resulted in many, probably most, Tutsi women in the Congo being vaginally impaled with objects as large as themselves. The left murdered about a hundred and seventy million people during the twentieth century, and we should just stop taking their pious cries of moral superiority seriously.
Leftists are weak people, are noisy women and weak men, who identify with power and cruelty, and thus identify with mass murderers and torturers like Che Guevera, Aristide, and Zapata. They loved the Khmer Rouge until the Khmer Rouge lost power by murdering each other until there were not enough competent Khmer Rouge left to uphold the regime. They loved the Khmer Rouge as long as the Khmer Rouge were successfully engaging in mass murder and mass torture, and hated them when, and only when, they lost, hated them not for mass murder and mass torture, but for weakness. As small boys identify with men who drive monster trucks, leftists identify with those who murder and torture. Hence the tendency of teenage boys to be radical leftists, and to cease being radical leftists when they reach their full growth and realize they need to be careful about getting into fights lest they kill someone with their bare hands.
So why are people reluctant to pick up this hundred dollar bill?
Because of an ideological left wing progressive belief in the potency of guerrilla warfare. In practice, guerrillas only succeed to the extent that they are backed by an outside power – usually the State Department. The Vietnam war with in part a proxy war between Russia and America with North and South Vietnam as proxies, but in larger part a proxy war between the State Department’s blue empire of the consulates, and the Pentagon’s red empire of the bases, as was increasingly obvious towards the end. Islamic state is largely a creation of the State Department, a part of their efforts to overthrown various Arab regimes, in particular Libya, Iraq, and Syria. Once they go back from State to State warfare down to guerrilla warfare and lose State Department backing, they will be insignificant.