I don’t want to get involved in your argument, but I do want to point out that Trump is not proposing a straight up 45% tariff on Chinese imports. He’s proposing using that as a threat that he believes will cause them to quit devaluing their currency and thereby make trade and prices more equitable between China and US. It would be cheaper for them to make their trade fairer in regard to US goods than to pay high tariffs, so Trump doubts he would even have to impose the actual tariff. He discussed this on the Fox Business Network:
https://www.youtube.com/watch?v=IQZ47EyQ9-Q
If you have been paying attention to business news over the last week, what China "chooses" to do with their currency is irrelevant for the foreseeable future.
With that being said, I cannot repeat this enough to those who do not appear to comprehend it:
Protectionism (tariffs) is good for manufacturers and precisely nobody else. It sound like a good idea because it appeals to our sense of nationalism, but it is always taxation, plain and simple.