Clearly Trump would have considered a slow down in Chinese buying as a potential response to his policy agenda.
It is doubtful in my opinion that just that would cause a crash that would bomb our country.
The reason is that the bond market has to be seen in an international context. For instance, weakening demand for us treasuries due to a single party (China) stopping purchases will drive the long term yield up. This will drive interest in the securities in other markets (Europe for instance which has very low yields).
A much more likely outcome is higher volatility in the stock markets which is good for investment banks that like short positions and bad for 401ks that like steady growth bull markets.
Posted this yesterday on the loop capital board as it looks like Loop is actively looking for events to shift the CBOE VIX: