Trump considered Jared Kushner for Secretary of State
Well, Kushner is the guy who was going to bring peace in the Middle East, remember?
But Trump undoubtedly realized that job was too small for a giant figure like Kushner and would limit the man too much, because he was also supposed to solve the opioid crisis, remake government, and reform the criminal justice system. He really needed to be in a supra-cabinet position with the Secretaries of State, Health and Human Services, and the Interior, as well as the Attorney General, all reporting to him.
In reality, that is not an entirely foolish idea, although the callow Kushner is not the man for the job. If the executive branch were a corporation, a management consulting firm would tell them that the CEO (President) has too many direct reports, and that he should have perhaps four or five at most, with those officials delegated to head up multiple executive departments. Even a brilliant guy can't effectively manage 15 or so direct reports, and a complete dunderhead (not mentioning any names) would get completely lost in the morass of things he has to deal with.
By the way, jokes aside, the real reason Trump could not name Kushner is that it would be illegal.
"A public official may not appoint, employ, promote, advance, or advocate for appointment, employment, promotion, or advancement, in or to a civilian position in the agency in which he is serving or over which he exercises jurisdiction or control any individual who is a relative of the public official."
In that law, the word "official" is defined to include the President, and the word "relative" is defined to include "son-in-law," so there is absolutely no way it could happen. But then again, this is Trump, and he's not likely to let a little thing like a so-called "law" prevent a great man like Donald Trump from making America great again!