The fault baked into this lead sentence of your post is the assumption that Trump actually cares about bringing down the price of oil.
First of all, from a 30,000-foot view, it's faulty on its face to assume Trump cares about making life better for the American people in the first place. He doesn't, which he has demonstrated so often that I can hardly believe people can keep a straight face whenever they say he does.
Secondly, to this particular point, it assumes that Trump is actually racking his brain trying to honestly figure out how to bring the price of oil down, but he simply hasn't been able to do so yet. As the authoritarian president of one of the world's largest exporters of oil, and who likely directly benefits financially from it by dint of how he has redefined his office, the interest he has in bringing down the price of oil can be safely assumed to be zero.
Apologies because you didn't ask for this, but I think the sentence would be far more accurate if rendered as: