Loans from China. Do I have this straight?

But they can start selling the loans they own. This will reduce the demand for bonds making it harder to finance our debt. They can also stop buying new ones.

China sells all the US bonds it is holding to those who are interested in buying. When the US tries to sell its own bonds there won't be any buyers. Actually, that would be good in the long run. It would prevent Trump and his thugs from running up the national debt.

or Bonds,they are Marketable at any time. Usual debt sales reflect these items. China has already dumped several Billion in US Treasuries in order to prop up their Yuan. Commodities usually are bought and sold in Dollars,in that lies our Nations Caution as to how we treat other trading Partners. Trump runs his mouth with out any so called push back. That ends a week from today,all bets are off.