As for the Saudis, they're much bigger sponsor of Islamist jihad than Iran will ever be.
Iran has been attacking us in Iraq for years. Using roundabout ways of course. They arm proxies armies. They like to have others do their dirty work. Like Hezbollah in Lebanon to attack Israel
Iran is trying to control Iraq since Iraq has a Shiite gov’t right now. They invented chess...you are still playing tic tac do
Saudi Arabia is or was an ally. They are very upset by our recent cave-in on Irans nuclear program