Hamdeen Sabahi's comments came today as many expect the country's military chief, Field Marshal Field Marshal Abdel-Fattah el-Sissi, will announce his candidacy soon.
El-Sissi, who led military ouster of Islamist President Mohammed Morsi in July, is widely popular and expected to win.
Sabahi, a leftist politician who came in third in Egypt's 2012 presidential elections, says he will not pull back from the race despite his objections to the country's new elections law, which places the elections commission above judicial review.