An American military attack against Iran’s nuclear facilities would take “a fraction of one night” to complete, if one was ordered by President Obama, said former Israeli Prime Minister Ehud Barak Thursday night. He was speaking to the Washington Institute for Near East Policy. Barak went on to say that this would be a simpler operation for the US than the assault planned last year against Bashar Assad’s chemical weapons infrastructure. “The American administration has changed its objective from no nuclear military Iran to no nuclear military Iran during the term of this administration," Barak said, adding that the US "is perceived to have been weakened" over the last several years.