An Israeli attack on Iran would be “destabilizing,” the chairman of the US Joint Chiefs of Staff, US Army General Martin Dempsey, said Saturday.“It’s not prudent at this point to decide to attack Iran,” Dempsey said in an interview with CNN’s “Fareed Zakaria GPS,” scheduled to be broadcast Sunday. The US government is confident the Israelis “understand out concerns,” he said in an e-mailed transcript. Dempsey said the economic sanctions imposed on Iran and international pressure are beginning to have an effect, without expanding further.