It doesn’t take much to perplex Marie Harf.

Via The Hill:

International inspectors report that Iran’s stockpile of nuclear fuel has increased about 20 percent over the past 18 months of negotiations, according to The New York Times.

The increase in Iran’s stockpile was based on a report issued Friday by the International Atomic Energy Agency, which monitors nuclear programs for the United Nations.
The report also said Iran had stopped producing certain types of highly enriched uranium since January, 2014 and halted work on facilities capable of producing nuclear bombs.

The Times noted that should negotiators finalize a deal before a June 30 deadline, Tehran would have to reduce its stockpile by more than 9 tons within months.