I don't think 20% of the budget is capable of being discretionary. If you're really wanting to do so, some government agencies actually accept donations. When I

I don't think 20% of the budget is capable of being discretionary. If you're really wanting to do so, some government agencies actually accept donations. When I sold my business, I donated to NASA. I couldn't earmark the donation for something like educational outreach as donations have to go into the general fund.