That Trump wants to help the American people is a conspiracy theory. Trump's conduct across decades, and as attested by his clinical psychologist niece and many others who know him, would demonstrate his monstrous selfishness and self-regard. He is petty, cruel (as described by his sister), and vindictive. He does not give a shit about any of you.
Let's be clear here: that spending bill he's complaining about was negotiated by his own treasury secretary. If he didn't know what was in it to complain about it long ago, then he's lazy and incompetent. If he did, then this sudden ruckus is a sham. As for the $600, negotiations for how much Americans would get have been going on for long enough and again, he had plenty of time to throw his weight behind a larger amount. Instead, he just threatens to screw with it at the last moment.
He's basically just a prick who is in temperament and competence unfit to be president.