I don't keep real current with political crap because it is too darn depressing and I have felt that way for decades.
But one thing I can tell you for sure, while Obama was still in office business was quite flat. The moment Trump got elected, business started flourishing. Also, the stock market kept rising.
Now, will business and the stock market have ups and downs, absolutely. Does the POTUS have direct control, NO, but they certainly have some influence.