The Nigerian states filling the court challenge to Bola Tinubu's presidential election - Adamawa, Akwa Ibom, Bayelsa, Delta, Edo and Sokoto - said in court papers dated Feb. 28 that the election body had failed to transmit results electronically through a system meant to show transparency.
They seek a court declaration that all presidential election results announced by the chairman of the Independent National Electoral Commission (INEC) "were invalid, null and void, and of no effect whatsoever."
The states are led by governors from the main opposition People's Democratic Party, whose candidate Atiku Abubakar came second in the presidential election, according to the official tally.
Election observers from the European Union, the Commonwealth and other bodies reported a range of problems, among them failures in systems designed to prevent vote manipulation.
The observers criticized INEC for poor planning and voting delays but did not allege fraud. The commission itself apologized for the technical problems during the count.
In Nigeria, elections are challenged at the Appeals Court, which sits as a tribunal.
But the six states sidestepped that normal process and instead sued the federal government, not INEC, arguing that this was a constitutional case, which falls within the jurisdiction of the highest court in Nigeria.
No date has been set for a hearing, according to the Supreme Court register.
Along with this legal challenge to the election, the Labor Party and its third-place finisher Peter Obi have also announced plans for a court challenge to the results.
There have been numerous legal challenges to the outcome of past Nigerian presidential elections but none has succeeded.