David Ward has accused Jean Todt of breaching the FIA's Code of Ethics in the run-in to the FIA presidential election.
This year Ward will stand against Todt in the election but Brit feels his opponent is not playing fair.
Earlier this month he filed a complaint with the FIA's Ethics Committee, citing what he believed to be Todt's use of FIA resources to secure formal written commitments.
Jorge Tomasi, the president of FIA's Region IV, responded to Ward's claims by saying it was "offensive."
Ward, though, has now written back insisting that "the use of support agreements or letters well in advance of the presidential election period is, in my opinion, a serious breach of the FIA laws, rules and regulations which threatens to undermine the fairness and transparency of the Federation's 2013 presidential election."
He added: "I strongly believe that the integrity of the FIA election process is of paramount importance. The FIA is the key regulator of motor sport's most prestigious world championships.
"It has the duty to ensure the fairness of these competitions, to discipline those that break the relevant sporting regulations, and to provide a right of appeal. The same principles should be applied to the FIA's most important internal competition, its own presidential election.
"The FIA must be seen to be trusted as capable of running all its competitions fairly, transparently and according to the rules. If not its entire credibility is put at risk.
"To use a sporting metaphor the support letters are like an illegal practice or a 'jump start' that has given Jean Todt an unfair advantage in the FIA's election race. They should not have happened, and the breach of the rules should be investigated and subject to an appropriate penalty.
"As you will know this matter is now subject to an inquiry by the Ethics Committee. I fully respect the Committee's need to deliberate carefully on the issues raised."
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