|Omar Suleiman's campaign says he was disqualified because of a problem with collecting voter endorsements [Reuters]
Three of Egypt's main presidential candidates have filed appeals after the election commission barred them from running, shaking up an already tumultuous race and political transition.
The election commission is expected to decide on Tuesday which appeals will be reviewed, and a final list of candidates will be released on April 26, just under a month before the May 23-24 vote.
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This comes as the United States on Monday voiced support for "free and fair" elections in Egypt but declined to wade into a debate over the disqualification of leading presidential candidates.
"Our only concern is that this is a free and fair and transparent process, that it move forward in a way that meets the aspirations of the Egyptian people," Mark Toner, the spokesman for the US state department, told reporters.
"But it's not for us to comment on the political process itself," he said.
The three disqualified would-be presidential candidates are Hazem Abu Ismail, the ultra-conservative Salafi candidate, Khairat al-Shater of the Muslim Brotherhood, and Omar Suleiman, the former intelligence chief.
They were barred along with seven others on Saturday on legal grounds.
||Omar Suleiman: Failed to get endorsements from 15 provinces as per law.
||Khairat el-Shater: Released from jail in March last year after being imprisoned on charges of terrorism and money laundering. Candidates can only run in elections six years after being released or pardoned.
||Hazem Abu Ismail: Mother allegedly holds dual US-Egyptian citizenship, violating election rules that mandate all candidates, their parents and wives have only Egyptian nationality.
Abu Ismail, a lawyer-turned-preacher with a devoted following, was reportedly barred from running because his late mother allegedly held dual American-Egyptian citizenship.
Under a new Egyptian electoral law, the candidate, the candidate's spouse or the candidate's parents cannot hold any citizenship other than Egyptian.
Abu Ismail has questioned why the election commission had not made public the documents that allegedly prove his mother held US citizenship.
Shater's candidacy had been challenged because of his previous criminal record.
Shater, who was deputy chairman of the Muslim Brotherhood - banned under Mubarak - had been in jail on charges of terrorism and money laundering. He was granted an amnesty this year.
His lawyers say that this means he is allowed to run.
Lack of voter endorsements
Suleiman, Mubarak's head of intelligence for two decades, was briefly appointed vice-president, but quit the post in February 2011 when the president resigned following weeks of mass protests against his 30-year rule.
Suleiman sent his assistant to file an appeal on Sunday. Suleiman's campaign says he was disqualified because of a problem with collecting voter endorsements, which means he has little chance of winning an appeal since he cannot submit new signatures.
This comes as Field Marshal Hussein Tantawi, Egypt's military leader, met with the heads of 17 political parties and groups on Sunday to discuss the dilemma surrounding the constituent assembly and the writing of the new constitution ahead of the first presidential poll.
Tantawi stressed that the new constitution had to be written by June 30, in time for the new presidency.
A panel created by parliament is supposed to draw up the document.
Last month, the Brotherhood and other Islamists, who hold 70 per cent of parliament's seats, formed a 100-member panel. However, a court suspended that panel due to fears that they it was trying to control the process.
The parliament must still vote on the final makeup.