The most dramatic impact on the evolvement of the Iranian challenge, particularly in its nuclear aspect, is attributed to an event that will take place outside the Middle East – the U.S. elections. The nuclear policy of both presidential candidates may pose a difficult challenge for Israel.
President Trump seems eager to reach an agreement with Iran quickly, even if he must compromise on its terms. Trump may present any agreement as better than that of his predecessor, former president Obama, even if it will not, in effect, address the grievous flaws of the JCPOA: the expiration of restrictions ("sunset"), advanced centrifuge R&D, and authority to oversee the weapons program.
By contrast, the Democrats' candidate, Biden, has announced that as soon as Iran will once again comply with the terms of the agreement, the U.S. will recommit itself to it as well, indicating the lifting of sanctions. According to Biden's plan, only then, when the sanction lever will have effectively been removed and his chances of success substantially diminished, will he enter into negotiations with Iran over fixing the JCPOA flaws.
At the same time, both Trump and Biden may be reluctant to pose a credible military threat to Iran during negotiations. Both seek to extract the U.S. from the "never-ending" wars in the Middle East, and expedite the removal of its forces from the region – two items on the U.S. agenda that enjoy a rare consensus among its divided public.