If Trump is able to create more jobs in the US hence devaluing YEN, then that is more good news for bitcoin. More demand from China drives up the price.
First of all, Trump is nothing more than a clown. I doubt he will get to create more jobs within the US. It's just a loud mouth. But just to answer your main point; More demand from China is a good thing for the short term, but it will also give the Chinese government far more incentive to tighten the regulations even further. They will do everything to prevent the average citizen from using Bitcoin as an investment/store of value tool,
where they potentially can get a big part of their wealth out of the country. That's China's main concern.
You forget that the buyers from China will be purchasing bitcoins from the same Chinese miners mainly, so no wealth will be moving out of the country, correct? Regarding controlling the Chinese citizens over what they are going to buy, I don't think they will ever do anything like that, at least directly, through administrative power. The authorities could try to control Bitcoin miners, which they may already be doing to a certain extent, but not the buyers.
China is not North Korea, after all.