Experts predict that regardless of the election result, the new US presidency will not drastically improve US-Iranian ties. Statements from Trump and Clinton have indicated little difference between their Iran policies.
In January, the international sanctions that had been imposed on Iran as a result of its nuclear program were lifted and the treaty between Iran and the international community, signed six months prior, was dubbed historic. Iran has hoped that Western investments would improve its economic situation, but so far, the remaining US sanctions on financial transactions and the tentative stance of many banks have kept foreign money from flowing into the country.
One diplomatic victory, albeit being welcomed from all sides, cannot resolve a decades-long conflict overnight. Whether or not the Iran policy of the next US President will promote the opening of the country's economy to global markets also remains uncertain.
Trump: "Worst deal ever"
Donald Trump calls the Iran deal "one of the worst deals ever made by any country in history." If he wins the election, the Republican candidate has announced that he wants to renegotiate the treaty. How exactly and with whom he plans to do so is unclear, since further discussion of the deal is not envisaged. The only possible measure to change the nuclear deal would be a "snapback" to sanctions in the case of Iran breaching the terms of the contract.
In terms of regional alliances, the Republican candidate is not close to Israel or the Arab countries, and he is also not partial to Iran. The political scientist Rasool Nafissi from Strayer University in Washington told DW that Trump's foreign policy is unpredictable. "Trump has no idea about international relations and its conventions," he said.
It is possible that if he wins the presidency, Trump will try and show off his political muscle, and the US' relationship with Iran could be the perfect stage for that.
Clinton's harsher stance
Trump's opponent Hillary Clinton is also not expected to bring the two countries closer together. The former secretary of state has taken a hard stance towards Iran in the past and is reported to be more Israel-friendly than incumbent US President Barack Obama.
Günter Meyer from the Centre for Research on the Arab World (CERAW) said in the Swiss newspaper Tagesanzeiger that Hillary Clinton might continue with a policy of military intervention similar to what she had followed during her term as secretary of state from 2009-2013.
In his statements, Meyer referenced a strategy paper by the US think tank, Center for a New American Security (CNAS), an organization leaning towards the Democrats and the arms industry. The paper calls for political, economic and military actions against Iran. Meyer added that Michèle Flournoy, the director of CNAS, is a potential candidate for the new secretary of defence and that the remaining sanctions against Iran could also be tightened under Clinton's supervision.
In any case, the new president will have to reassess the role of Iran relating to the wars in Yemen and Syria - a situation in which Clinton could be less lenient towards Iran than Obama is.
Iran's hardliners could profit
Whether the next president is Clinton or Trump, the result will have a significant effect on the government in Tehran. Iranian political scientist Sadegh Zibakalam told DW that the cooling down of US-Iranian relations could stand in the way of Iranian President Hassan Rouhani's politics. "The more hostile the American president is towards Iran, the happier the hardliners in the country will be," he said. "It will give them justification for their distrust towards the US and their anti-American ideology."
Iran's Supreme Leader Ayatollah Ali Khamenei pronounced Wednesday in a gathering marking the anniversary of the 1979 Iran hostage crisis, that it was wrong to believe that compromises with the US could resolve the country's problems. He also rejects any cooperation with the US in finding a solution for the conflicts in Syria, Iraq, Afghanistan or Yemen.
Despite the hostile positions of US opponents, Zibakalam said that Rouhani will make efforts to strengthen the ties between Washington and Tehran -as long as this benefits Iran. But whoever wins the US election, it is probable that Iran will have less leeway with the US than it has had up to now.