Trump and interest rates?

Can someone please put it into simple terms why Trump is so obsessed with having the FED lowers interest rate? To the point he has harassed, threatened, and said he would sue Powell?

It’s just confusing to me that this man, who is indifferent to actually governing in most other ways, is so hyper focused on this for a long time?

He doesn’t do anything to actually help people. Or make progress. So in my mind there was to be a reason that’s beneficial to him? Or detrimental to the U.S.?

Sorry if this isn’t the right place to post a question like this.