US President Donald Trump's decision to make his country exit the Iran nuclear deal has brought some uncertainty over global oil and gasoline prices. At a time when global oil prices are already very volatile , thanks to production cuts by the Organization of the Petroleum Exporting Countries (OPEC) and Russia, and instability in Venezuela, Trump's move to pull out of the Iran deal also known as the Joint Comprehensive Plan of Action (JCPOA), could curb the OPEC nations' crude oil exports. Iran's oil exports to China, Europe and other countries would most likely decline later this year and in