TEHRAN (Reuters) -- Two prominent defeated Iranian presidential candidates said they would maintain their campaign against President Mahmud Ahmadinejad's reelection, which has sparked Iran's worst unrest since the 1979 Islamic Revolution.
Ahmadinejad will be sworn in by parliament on August 5, and the authorities will want to avoid any repeat of the street unrest after the disputed June 12 poll in which at least 20 people were killed and hundreds were detained.
Leading moderates have accused the government of electoral fraud and have branded the next Ahmadinejad administration as "illegal."
The wife of Iran's opposition leader Mir Hossein Musavi said on August 4 he would continue to contest the election result.
"Despite all the hardship, we will continue our path to fight against the result [of the election]," Zahra Rahnavard was quoted as saying by the reformist website Mowjcamp.
Mehdi Karubi, the most liberal of the presidential candidates, was quoted by the Spanish "El Pais" daily as saying he too would continue to oppose the government.
"Neither Musavi nor I have withdrawn. We will continue to protest and we will never collaborate with this government. We will not harm it, but we will criticize what it does," Karoubi said in an interview.
"Quite honestly, if the authorities had acted in a different way, we would never have had these problems, because the majority of those protesting only did so for that reason."
U.S. President Barack Obama and the leaders of France, Britain, and Germany have all decided not to congratulate Ahmadinejad on his reelection.
"In view of the circumstances of the controversial reelection, the chancellor will not, as usual, write the normal letter of congratulation," said a German government spokesman.
White House spokesman Robert Gibbs said: "I don't have any reason to believe we will send any letter."
The Iranian government says the presidential election was fair and transparent and has accused Western nations, especially Britain and the United States, of being complicit in the bloody post-election unrest, a charge they deny.Servant Of The Revolution
Two former presidents, Akbar Hashemi Rafsanjani and Mohammad Khatami, who backed Musavi's failed presidential bid, boycotted the endorsement of the president by the Supreme Leader although they were present at such events in the past.
After the ceremony a witness said hundreds of Musavi supporters, some of them honking car horns, gathered near a central Tehran Square, where riot police and Basij militia were assembled to prevent any demonstration.
Musavi's credentials as a loyal servant of Iran's revolution may help explain why he has escaped arrest for leading protests against an election he says was stolen to keep Ahmadinejad in power.
The 68-year-old moderate may lack charisma, but he has not hesitated from speaking out, castigating authorities for their handling of the election and its tumultuous aftermath. He has even defied his relative, Supreme Leader Ayatollah Ali Khamenei, who backed Ahmadinejad.
"What has endeared him to the public is the fact that, contrary to former President [Mohammad] Khatami who would be reluctant to stand up to Khamenei and others, Musavi has stuck to his guns," said Mehrzad Boroujerdi, an Iran scholar at New York's Syracuse University.
Musavi has previously demanded the elections in the world's fifth biggest oil exporter be annulled, but may need a new goal once Ahmadinejad is reinstalled.
"The plan should be to call into question the legitimacy of Ahmadinejad's administration at every turn, through civil disobedience, and also to press for some revisions to the constitution," Boroujerdi said.
The president now faces the difficult task of assembling a cabinet which is acceptable to the mostly conservative parliament, which may object if he just picks members of his inner circle. Parliament has in the past rejected some of Ahmadinejad's cabinet choices.
Musavi has yet to unveil a promised new political front with his reformist and pragmatist allies, perhaps partly because so many leading figures are in jail, including 100 whose trial for inciting unrest began on August 1 and resumes on August 6.
Karubi backs talks with the United States and other Western governments to attempt to open up the channels of communication with Iran, which is locked in dispute over its nuclear program that it says is for energy and the West suspects is for arms.
"The most beneficial thing for the Iranians is negotiations. Nobody benefits from our ongoing problems with the United States," said Karubi, highlighting one of the fissures in the clerical leadership that the election has exposed.
Another potential source of friction with the United States arose on August 1 when Iran arrested three American hikers who an Iraqi Kurdish official said had strayed across the border and who were being questioned by the Iranians.
"They are definitely Americans. They were detained four days ago. We don't know whether they are tourists or not. We are questioning them," security official Iraj Hassanzadeh told al-Alam state television on August 4.
Disputed Presidential Vote
There have been protests and clashes with police on the streets of Tehran following the disputed reelection of Mahmud Ahmadinejad. RFE/RL collects videos, photos, and messages on social-networking sites coming out of Iran to attempt to get a picture of what is happening inside the country. Click here
The Battle For Iran's Future
With much more than a disputed presidency at stake for Iranians, RFE/RL's Charles Recknagel and Mazyar Mokfi explore the power plays that could reshape Iran's political establishment.Click here
for news, blogs, and analysis of the presidential election and aftermath.