Envoys for the United States and three allies are warning the UN nuclear agency chief to avoid making comments that could undermine efforts to have Iran end its nuclear program.
US, British, French and Japanese officials met with Mohamed ElBaradei on Friday at International Atomic Energy Agency headquarters in Vienna.
Diplomats say they criticized ElBaradei's recent remarks to reporters, in which he said Iran should be allowed to process some uranium.
A UN Security Council resolution demands Tehran stop all uranium enrichment.
Thursday, President Bush said the U.S. will work with its allies to strengthen sanctions against Iran because of its refusal to stop enriching uranium, which can be used to produce a nuclear weapon.
Iran's President Mahmoud Ahmadinejad has vowed to push ahead with his country's nuclear program.
The United States and its allies accuse Iran of trying to develop nuclear weapons. Iran says its atomic program is intended to produce electricity.