 The U.S. government then began pushing for UN sanctions against Iran over its nuclear program.The United Nations Security Council (UNSC) adopted Resolution 1737 in December 2006, Resolution 1747 in March 2007, Resolution 1803 in March 2008, and Resolution 1929 in June 2010.In June 2005, President George W. Bush issued freezing the assets of individuals connected with Iran's nuclear program.