President of the United States (2008-2016). Obama and his administration were major proponants and architects of the Iran Nuclear Deal.
United States Secretary of State (2013-2016). Kerry was the United States' chief negotiator for the Iran Nuclear Deal.
Current president of Iran (2013 - ). Rouhani backed the Nuclear agreement and has vowed to stay in it even though the United States has left.
Former president of Iran (2005-2013) who, during his tenure was a strong supporter of the Iranian Nuclear program
Current Supreme Leader of Iran (1989 - ). Kahamenei has made statements in opposition to nuclear weapons on moral and religious grounds.
Current Prime Minister of Israel (2009 - ). Netanyahu is a strong critic of Iran and it's nuclear program. His has compared Iran to Nazi Germany and has accused Iran of breaking the terms of the Nuclear agreement.
Current President of the United States (2016 - ). During his campaign, Trump strongly criticized the Iran Nuclear Deal and vowed to pull the US out, if elected. On May 8, 2018, he did just that.
Current United States Secretary of State (2018 - ). As a Congressman from Kansas, Pompeo strongly criticized the Iran Nuclear deal and worked to undermine it.
Current US National Security Advisor (2018 -). Bolton is a strong critic of the Iran Nuclear deal, who has advocated regime change in Iran.