Cain made his remarks at the Values Voters Summit in Washington, D.C. on Friday.
“I would make it a priority to upgrade all of our Aegis surface-to-air ballistic missile defense capabilities of all of our warships, all the way around the world," he said. "Make that a priority, and then say to Ahmadinejad, ‘Make my Day.’”
Mahmoud Ahmadinejad is the president of Iran.
The “make my day” phrase is in reference to the 1971 tough-cop movie starring Clint Eastwood who plays the policeman Harry Callahan. In a famous scene, just before he shoots the bad guy, Callahan urges the killer to try to grab a nearby gun, saying, “Go ahead, make my day.”