The government has thought of it. It either doesn’t work very well, or it works so well that the US loses strategic commodities without review.
Example:
Hamilton Field. A premier Air Force Base which was to be shut down and disposed at public auction during the Vietnam War.
Every time it goes up for sale, a pecking order of other government agencies have an opportunity to take control of it to save the government money.
About every 4-7 years, it has bounced between the Air Force, Navy, Coast Guard, Marin County, City of Novato, back to the County, back to Novato, homeless shelter, enterprise zone, housing, even the lease to keep pumps running so the San Francisco Bay doesn’t reclaim it have expired and reissued by other agencies.
Let’s also look at all the Cement and Coal the Clintons sold out to the Chinese, forcing the US into a cement and concrete shortage.
Selling an asset from one government agency to another doesn’t save money.
Also, Trump hopefully doesn’t mean sell anything to foreign countries, other than the oil we product from federal lands.
Land is not Air Force bases.
Don’t think a half-assed effort refutes Trump’s idea.