I don't think he's made it worse, but when he took office the economy wasn't exactly in shambles. In other words, he inherited a pretty good economy from Obama.
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He can't take credit for everything though.
We will see whether or not he has made it worse when the effects of his trade policy kick in. He will have to take credit/blame for that. I predict that he will make it worse, and his actions could trigger the next recession.