Sen. Lindsey Graham (R-SC) has called for the United States to change its policy toward Iran because the Middle Eastern country is not “afraid of us.”

Graham’s suggestion for such a change would be hitting Iran in areas the country’s leadership values, such as its place in the oil industry. The senator argued U.S. troops in the Middle East are “in harm’s way” after three U.S. service members were killed in a drone attack launched by an Iranian-backed militia last month.