A foreign-supplied aircraft is pretty much guaranteed to be filled with listening devices, and won’t have the protective measures that are built into the US Air Force One. Not to mention the bribery problem with planning on using it for personal use after leaving office.
True, but do any world leaders really expect privacy when they have calls with Trump? Like if you met Donald Trump for the first time, knowing absolutely nothing about the guy, how long do you think it would take for you to realize that you shouldn’t share secrets with him?