Amino Agus Suyub can be charged under the Election Offences Act for breaching his official duty, it says.
The Umno president says the party is preparing for any eventuality involving his deputy's seat.
Commission says the matter should be heard in an election court, as it concerns election laws.
GE14 | Mohamad says the incident was staged to give a negative perception of the EC.
GE14 | PKR veep dares incumbent Rembau MP Khairy Jamaluddin to 'come clean' on the matter.
UPDATED 7.10PM | The Rantau candidate issues a letter of demand to EC over the nomination day fiasco.
GE14 | Caretaker MB says this was because the opposition knew it was not possible to win Rantau seat.
GE14 | Electoral watchdog cites three cases, which it claims have compromised the integrity of the polls.