That's been the standard US Presidential SOP since Nixon developed a serious drinking problem and Kissinger demanded all orders go through him first (so as to avoid WW3).

They had an old, dementia ridden actor, and the dumb-ass Bush son for that reason, too. HW Bush could handle his shit but he raised taxes and puked on the Japanese PM so that's a pass. Trump is just another stooge to be kept in line so that his doners get what they want.