America should not go to war with Iran now. That's what the enemy wants. The endgame is to get nuclear powers like America and Russia fighting each other. Since Russia is currently allied with Iran, if the situation escalates, it could all go bad quickly.
I think President Trump knows this, and I don't believe he will go for open war. Selected airstrikes on specific targets, maybe. But no more.
America should forge a new Christian alliance with Christian Russia for this new decade. Russia has nothing at all in common with Islamist countries like Iran. President Raegan did a great job in coming to the aid and moral support of the Catholic Church and Catholic Poland in particular that led to the Solidarity movement and the downfall of Communism in Eastern Europe and ultimately Russia. But it's been downhill since then mostly in the West.
The West at large, because it has itself gone agnostic secularist, has not been able to credibly advance the argument that, while Christianity and Communism most certainly are mortal enemies and incompatible, America and Russia need not be.
First and foremost, like President Reagan astutely did in breaking up the Soviet Union, to break up Islamist terrorism around the globe, break up the uneasy alliance Russia has been forced to forge with them. After that, Islamism can be conquered.
President Trump is the right man for this job as well in the long run. He has often spoke of wanting to work together with Russia against Islamism. Unjust wars are useless and wrong. Islamism has to be fought in other ways.