I would argue that capitalists in general do run things to a large extent, and I think that the president being the most powerful person is not really true. It’s more of an oligarchy at this point than full autocracy, but if things keep progressing towards their logical conclusions, it will be something closer to that.
Why do we get into the wars we’re getting into? It’s all about those capitalists gaining access to resources, laying down oil pipelines, making money from defense contracts, etc. It’s never just to actually help people, although sometimes it is to stop socialist movements or alternative currencies etc. because they are a threat to the capitalist hegemony.
Trump acts in the interests of the wealthy in general, so who has he met with and who has influenced his decisions? I don’t know for certain, but I’m reasonably sure they are doing so, as they did with every president before, and that that’s how it generally works.