Subject: Re: Trump Steps on his own Trade Policy
I doubt they have many actual dollars lying around. The dollars that they have previously acquired have all almost certainly been invested already, whether in t-bills or private assets.

You identified several possible ways to obtain US $ if/when needed. Selling assets owned could be one way. US Treasury debt is continuously being retired and resold, so any debt owned by the Saudis could be used to pay bills in US $ as they came due (IMO, they have the ability to do so--if they find it necessary). Another point is simple: They will almost always have US $ being paid to them for oil sales, so those funds could also be used when available.