I’m pretty sure this whole plan is outlined by the Pentagon and the president just signs off. Not like he has much say in the matter anyway since he is just the rubber stamp tool of the military industrial complex.
People are simply brainwashed into thinking the president has any real power. He is just a figurehead and takes his orders from the powers that be: weapons manufacturers and their corporate shareholders who will profit from these sales.
The real issue is that the US economy is propped up by continued warmongering and arms sales. It doesn’t really matter who the president is anymore, he just signs his name on the piece of paper that is handed to him. A good president can use procedural loopholes to soften the blow a bit or maybe sell it as a good idea.
Trump is an idiot who doesn’t care and will do whatever makes him more money, be it from Russia, China, or the Saudis. He doesn’t care. He is for sale to the high bidder, domestic or foreign. He doesn’t have the bandwidth, capacity, or desire to give a shit.