This would take a WW2 style and size ground force. Since Russia is an ally to Iran a ground force invasion will quick turn into a Ukraine style drone ground war nightmare. I can not envision that Trump would survive the mid term ballot and sure turn into a sitting duck for the last part of his term. A ground invasion will become a lot worse than the middle east wars before. I have no idea why Trump did take this risk. He boxed himself into a corner with little escape outlook.