07/30/2012
https://www.presidency.ucsb.edu...
"U.S. sanctions have deterred investment in Iran's oil and gas sector for years."
"I have issued an Executive Order that takes additional steps with respect to the national emergency declared in Executive Order 12957 of March 15, 1995."
"The Congress found that the illicit nuclear activities of the Government of Iran threaten the security of the United States."
"These new authorities will allow the United States to target directly Iran's attempts to subvert U.S. sanctions."