The 1979 revolution in Iran, led by Ayatollah Ruhollah Mousavi Khomeini, transformed the USA -backed and monarch-ruled country into a republic system under the Islamic ideology.
Reuters reported that Rouhani told a crowd of supporters at an indoor stadium, that he would not let Iran become isolated again if he became president and that he was seeking constructive and effective interaction with the world.
Presidents also have tremendous influence over the economy.
Some experts say Iranian establishment figures may want to keep Rouhani in power to avoid being cast back into isolation.
Rajaei was assassinated on August 30, 28 days after assuming his presidency.More news: Synchrony Financial (NYSE:SYF) Under Analyst Spotlight
Raisi is believed to be the favorite of Supreme Leader Ayatollah Ali Khamenei, who will remain Iran's top decision-maker, but it's unclear whether Raisi will be able to unseat Rouhani.
That past has anxious moderates and reformists in Iran. It is time for the West to rid itself of this misguided perception, fomented by Tehran's lobby, that the people of Iran consider serious differences between the candidates.
Khatami advocated increased contact with the United States, but his domestic opponents hindered rapprochement between the two countries.
"The expectation of us and the people is that this decision sets the stage for a new era of economic transformation that, by cutting off the four-per-centers from the economy, will lead to youth employment and support for the underprivileged and poor in Iran", he said. Qalibaf pulled in 4 million votes in the first round of balloting in 2005 and over 6 million in 2013.
Ahmadinejad presented himself as a populist, focusing on issues such as poverty and social justice.More news: Mourinho: Some Man Utd players deserve to rest
"Iran's presidential election will convey a significant message to the global community and Muslim nations ..."
His second term, which ended in August 2013, was featured with a confrontation with the Khamenei and the parliament. "Who finances them?" said Mr Rouhani at another point.
In the last election four years ago, Qalibaf finished second but with just 16.5 percent of the vote. Removing more sanctions will be a tall order given the current stance of US President Donald Trump, who has harshly criticised the nuclear deal and vowed to take a tougher line on Iran.
But since the nuclear deal came into force in January 2016, lifting some sanctions in exchange for curbs to Iran's atomic programme, only $1-2 billion worth of deals have actually been finalised, his deputy Eshaq Jahangiri admitted to AFP this week.
The six candidates selected to run by the conservative-dominated Guardian Council are evenly split between moderate-reformists on one side and hard-liners on the other, and the debates have the feel of two teams clashing.More news: How to keep your PC safe from the massive ransomware attacks
Tehran mayor Mohammad Bagher Ghalibaf withdrew from Iran's presidential race on Monday, paving the way for a head-to-head battle between president Hassan Rouhani and the leading hardline challenger in this week's election. It is likely others will drop out to solidify support for other candidates, especially as one of them is serving as vice president in Rouhani's government.
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