> When was the last time a U.S. President ever vetoed a Federal budget? <
That’s a good question. I just did a quick search, and could find no information on that. Anyway, suppose it’s been a century. That doesn’t vindicate Trump in this regard. It just means that all of them have been negligent.
The budgets Congress passed bore little resemblance to what he proposed.
That's why U.S. presidents don't veto budgets. Congress controls every penny in Federal expenditures. Budgets proposed by presidents are little more than political grandstanding.