No, I don't mean that Donald Trump is a supporter of ISIS. But he is certainly doing just what ISIS wants. His attacks on Muslims bolsters ISIS's claim that the West is at war with Islam. The more Trump rails against Muslims in general, he helps recruit disillusioned or disaffected Muslims to join ISIS or to carry out attacks in the West. The more attacks, the more people like Donald Trump will over-react. The more over-reaction, the more recruits and the more attacks.
The only counter to a vicious cycle is a virtuous cycle. Probably the best tactic is to out-Qur'an ISIS, especially considering some of their camps don't even have copies of the Qur-an. Consider that few in ISIS even know "...and you should forgive and overlook: Do you not like God to forgive you?” (Qur’an: Surah 24, v. 22)
