Follow the money...
Never forget about "Trump's Razor" - his actions are usually explained in the stupidest and most corrupt way possible.
I don't have any specific evidence, but based on the way Trump is acting it looks like one of his buddies (or Trump Org) has investments in a Huawei competitor.
His goal was simply to slow Huawei down a bit so they didn't get quite as large a share of the global 5G projects. And of course Trump is willing to blow up the world economy as long as he gets what he wants personally.