Well, that's not for lack of trying. He subjected Iran to a strict regime of (illegal) sanctions, then assassinated Iranian general Qassem Soleimani. That could

Well, that's not for lack of trying. He subjected Iran to a strict regime of (illegal) sanctions, then assassinated Iranian general Qassem Soleimani. That could easily have started a war. Now, I should perhaps qualify the above, since there are reasons to believe that Trump was not really able to get his way, foreign-policy-wise, due to military-intelligence-industrial complex objections, plus his defense secretary, head of the CIA etc (poor staffing which is mostly on him).