nuclear deal

The 2015 deal allows Iran only to keep a stockpile of 202.8 kilograms.

Tehran has been violating the deal's restrictions to pressure the remaining parties to provide new incentives.

But it does inch Tehran's program closer toward weapons-grade levels of nuclear material.

The agency confirmed Nov. 17 that Iran’s stockpile had reached 131.5 tons.

Salehi again expressed Iran's ability to step back if a deal is made.

President Donald Trump argued that the accord did not limit Iran's ballistic missile program.

The deal limited Iran to 300 kilograms of uranium enriched up to 3.67 percent.

But the details of what is sure to be a complex and contentious process have yet to be settled.

In the past, Trump has spoken of the "horror" of life in North Korea and met in February with eight defectors from that country at the White House.