What is the worst case scenario for keeping a large sum of money in a U.S. Treasury Market Fund (SNSXX)

Hi all,

As the trade war escalates every day, I've been evaluating my investments from the perspective of a worst case scenario situation. I currently hold a substantial portion of my net worth in a U.S. Treasury Money Market Fund by Schwab - SNSXX. This includes a house fund, which will be utilized next summer while being contributed to regularly and 60% of a rollover IRA that I moved to safer assets last year (SNSXX).

In the worst case scenario, which I imagine would be China/Global holders mass liquidating U.S. Treasuries, what could happen to this fund? Is there a potential that this fund "breaks the buck", and I could lose a substantial portion of my assets?

I'd just like to hear some thoughts on this. It is nice collecting "risk free" income every month while I work toward financial goals, but is it worth the exposure to a quickly collapsing global trade system?

Schwab does not offer a High Yield Savings Account, hence the reason I hold these assets in what \*should\* be safe funds. However, if there is a risk, no matter how small, that I could these assets lose value, then it may be worth forgoing the interest and holding straight cash.

Thanks all for your insights!