Here's a breakdown of foreign debt ownership:
https://www.statista.com/statistics/246420/major-foreign-holders-of-us-treasury-debt/
The only real concern at this point is Japan given how much they own. If the Bank of Japan must continue its aggressive yield curve control policy (BoJ buys their own credit/Japanese stocks), this would cause them to sell some Treasuries thereby putting some pressure on US credit markets.
But really not much, foreign demand for Treasuries is still quite strong.