Article II, Section II provides that: “The President...may require the opinion, in writing,of the principal officer in each of the executive departments, upon any subject relating to the duties of their respective offices”
Why Presidents might need to retain documents of every type (quote):
“The depths of his dishonesty is just astounding to me. The dishonesty, the transactional nature of every relationship, though it’s more pathetic than anything else. He is the most flawed person I have ever met in my life.”
Former White House chief of staff, retired Marine Gen. John Kelly
“he constantly engages in reckless conduct that puts his political followers at risk and the conservative and Republican agenda at risk.”
William Barr, Trump’s former Attorney General
“An earlier draft of his Farewell Address showed how wounded the President[George Washington] was by the attacks on his integrity and motivations: ‘As this Address, Fellow citizens will be the last I shall ever make you, and as some of the Gazettes of the United States have teemed with all the Invective that disappointment, ignorance of facts, and malicious falsehoods could invent, to misrepresent my politics and affections; to wound my reputation and feelings; and to weaken, if not entirely destroy the confidence you had been pleased to repose in me; it might be expected at the parting scene of my public life that I should take some notice of such virulent abuse. But, as heretofore, I shall pass them over in utter silence...’”
https://www.mountvernon.org/library/digitalhistory/digital-encyclopedia/article/press-attac