Should a professor pass a student who deserved to flunk for fear of reprisals?

Because you've taught at the university level, I want to ask you about integrity in grading as a professor. Suppose you flunked a student who never showed up to class and didn't complete the assigned work adequately. However, this student was well-connected to university donors and administrators. After you flunked this student, suppose that a high-ranking administrator threatened reprisals against you if you didn't give this student a passing grade. What should you do? Would it be corrupt to comply with the administrator's demand? What might you (or another professor) do instead?