I wouldn't be surprised if

King - man + child = Trump

You shoehorned politics into a completely unrelated discussion, consequently making it worse

Unlike the 21st century US, historically it often didn't go well for kids who became monarch.

Henry VI doesn't get murdered early on and his regents do a reasonable job but he did end up dying in the Tower anyway because of the Wars of the Roses which is arguably his fault.

Edward V for example was 12 when he became King of England. His uncle sent him to the Tower of London, "for safety" and he never came out, it is generally assumed he was murdered.

Edward VI dies before reaching majority, and seems mostly to have been used as a device to control England by older men.

Liz I is sometimes portrayed as being a young girl but she's in her mid-20s and has survived Henry VIII's court, so nobody was going to disappear her to the Tower.

Trump is of course an old man with only the mind of a toddler. But England never had any of those, and it has long since moved (after killing Charles I) to a constitutional monarchy, separating the figurehead role (for which I think Trump was suited) from the executive role (for which I think it would be hard to imagine a worse candidate).