"... what can legally be done ? "
This election needs to be investigated,
a "Special Prosecutor" need to be appointed,
and ALL of the guilty, including the "ESTABLISHMENT REPUBLICANS" who help engineer this theft, need to go to jail for the MAXIMUM amount of time, after they have been fined to the maximum amount and had that amount garnished from their accounts and any wages.
They need to be
MADE "EXAMPLES" OF so as to discourage any other people from even thinking about doing this THEFT again !