Residential and commercial properties sit illuminated on the city skyline in Tehran, Iran, on Tuesday, Aug. 25, 2015.

Simon Dawson | Bloomberg | Getty Images

Residential and commercial properties sit illuminated on the city skyline in Tehran, Iran, on Tuesday, Aug. 25, 2015.

Security in the capital has been increased to the highest level, the police said, two months after gunmen linked to the Islamic State group attacked the parliament and the mausoleum of the late Ayatollah Ruhollah Khomeini, killing 17 people.

Rouhani’s deputy said on Wednesday that Rouhani would keep on two important ministers for his second term: Oil Minister Bijan Zanganeh, who is largely credited with closing a deal with the French oil major Total, and Foreign Minister Zarif, Iran’s lead negotiator in the nuclear agreement.

The powers of the elected president are limited by those of the unelected Supreme Leader who outranks him, but the scale of Rouhani’s victory can give the pragmatist president a strong mandate.

However, analysts say Rouhani may struggle to make a significant impact given sharpening divisions in the dual clerical-republican power structure in Iran, and Trump’s aggressive policy against Tehran.

While he spoke much about women’s rights during his campaign, Rouhani is not expected to select any women for his cabinet.

He also has a debt to pay to reformists who put their weight behind his election campaign.

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