That is nobody's business either. And if it is on his return, it is the IRS's business and Trump's business only!
And as for 'bona fide' charities, I don't contribute to United Way or the American Red Cross...top heavy, vulture organizations. I would rather give to needy individuals, non-deductible, and not appearing on the tax return. In fact, we do this...and from what we have heard, Trump does this too.
It is certainly not required I just appreciate it when people willingly disclose it.