Dks01 Not whom you might think.
Yes it is. The trust was formed by an act of Congress and are also subject to any other acts if they so choose. An act of Congress created the trust of the Smithsonian and another one just yanked Discovery out of it’s collection. Power of the People.
Take a look at who consists of the Board of Regents:
The Board of Regents now has seventeen members: the Chief Justice, the Vice President, three members of the Senate, three members of the House of Representatives, and nine citizen members appointed by Joint Resolution of Congress.
Why do you think they chose to take Discovery? Because Atlantis and Endeavour are indisputably in private ownership now.