 Complete the following phrase:  The crisis quickly became the subject of international and domestic attention, and Carter vowed to secure the release of the hostages. He refused the Iranian demand of the return of Pahlavi in exchange for the release of the hostages. His approval ratings rose as Americans rallied around his response, but the crisis became increasingly problematic for his administration as it continued. In an attempt to rescue the hostages, Carter launched Operation Eagle Claw in April 1980. The operation was a total disaster, and it ended in the death of eight American soldiers. The failure of the operation strengthened Ayatollah Khomeinis position in Iran and badly damaged Carters domestic standing. Carter was dealt another blow when Vance, who had consistently opposed the operation, resigned. Iran refused to negotiate the return of the hostages until Iraq 