Are the contributors listed somewhere? If they are it is still up to the POTUS to honor them or shank them. He is POTUS, and POTUS can do what he wants. He can literally rat those people out, and tell the public what those contributors "want" the next POTUS to do.
He can make up some sinister conspiracy, and the public will demand something be done. He can then have those people arrested, and throw away key. Or he can be hush hush about any world domination schemes, and just play along.