U.S. Secretary of State Hillary Clinton Sunday urged Iran to change what she called its "dangerous" nuclear policy.
In a speech to the U.S.- Islamic World Forum in Doha, Qatar, Clinton said Tehran's current stance leaves the international community little choice but to impose what she called "greater costs" on Iran.
The United States has been pressing the U.N. Security Council to impose a fourth set of sanctions on Iran, which has been balking at pressure to curtail its uranium-enrichment activities.
The United States and its allies have accused Iran of trying to develop nuclear weapons, but Iran says its nuclear program is for peaceful purposes.
Clinton is also scheduled to hold talks with officials in Saudi Arabia that will center on Middle East issues. In addition to Iran, those issues include efforts to restart Israeli-Palestinian peace talks.