What is an example of the controversial foreign policy move made by Jimmy Carter?

One controversial foreign policy move made by Jimmy Carter was the decision to allow the Shah of Iran to enter the United States for medical treatment in 1979. This action inflamed anti-American sentiment in Iran and contributed to the Iranian Revolution, leading to the takeover of the U.S. Embassy in Tehran and the hostage crisis. Critics argued that the decision undermined U.S. relations with Iran and destabilized the region.