Worse, he went out of his way to confiscate the translators' notes.
Yes, this horrified me.
I have attended meetings - at a much lower level, obviously, my principal would have had ambassadorial rank - where I was the person to the side, the adviser, notebook to hand, taking notes, (and would also minute the meeting, and prepare the formal notes from the meeting) and ready with advice or supplementary questions as needed, or was seated in the row of chairs along the wall, with other advisers, while the respective principals sat at a table.
And I have quite a bit of experience; candidly, I have never seen anyone - at any level - conduct formal meetings with international interlocutors (and, I daresay, with domestic interlocutors as well) - in the criminally careless, utterly unprepared, and outrageously irresponsible, manner that Mr Trump has done.