On Thursday, Rouhani vowed to focus on economic growth of the country as he was endorsed by the Iranian Supreme Leader as Iranian president for his second term.
Iran and the P5+1 countries, namely the US, Russia, China, France, Britain and Germany inked the nuclear deal, officially called the Joint Comprehensive Plan of Action, on July 2015 to end United Nations sanctions against the Islamic state, which was being accused of developing nuclear missiles.
Meeting Mogherini before the ceremony in parliament, Rouhani called for greater efforts to uphold the 2015 nuclear deal struck by Iran and world powers despite the fresh U.S. sanctions passed last week.
Analysts said Rouhani may struggle to make a significant impact given sharpening divisions in the dual clerical-republican power structure, and Washington's return to an aggressive Iran policy since Donald Trump took office.
Addressing religious, military and political leaders, Supreme Leader Ayatollah Ali Khamenei, Iran's top authority, prayed for "the success of a worthy person".
Iran's Interior Ministry has chose to raise security level at the Parliament to "critical" during the inaugural ceremony.
Trump signed off the new sanctions - which also target Russian Federation and North Korea - on Wednesday.
Teenager jumps out of a plane in San Francisco
The US citizen was traveling alone and appeared to be in emotional distress during the flight, airport spokesman Doug Yakel said. In his statement , Yakel mentioned that no other flights or runaways had been affected and the boy was not injured too.
In the meantime, the U.S. imposed sanctions on Iran have shed shadows over the outcome of the nuclear deal, with President Rouhani vowing to respond to the "US breach of the terms of that deal". The government line-up is due to be officially unveiled on Saturday at a high-profile inauguration ceremony in parliament in the presence of foreign guests, including European Union foreign policy chief Federica Mogherini.
"Iran has proved that it will respond to respect with respect, and to sanctions and threats with an appropriate response and with resistance", he added.
The new parliament will also vote on a bill boosting financial support to the Revolutionary Guards and the country's missile programme, which are targeted by the sanctions.
Rouhani defeated hard-line conservative Ebrahim Raisi in Iran's May 19 election after garnering 57 percent of the vote.
Rouhani stressed the importance of a strong economy in the country and said the next government eyes economic reforms.
"The remarks by the Iranian president show that Iran is not paying respect to the Helmand River agreement signed between Afghanistan and Iran in 1970". Rouhani has to announce his new cabinet members to Parliament within 14 days.