CBS News:

VIENNA -- U.S. Ambassador to the United Nations Nikki Haley arrived at the headquarters of the International Atomic Energy Agency (IAEA) on Wednesday to increase the Trump administration's understanding of Iran's compliance with the nuclear deal reached under President Obama, but also to try and ratchet up pressure on Iran after its recent ballistic missile tests.

Haley met IAEA Director General Yukiya Amano, and was also to meet some of the technical experts who monitor nuclear activities, including those in Iran governed by the nuclear pact signed by the U.S., a handful of its allies, Russia and Iran.

In a statement released after her meeting with Amano, the U.S. United Nations delegation said Haley had stressed U.S. "concerns about ensuring Iran strictly adheres to its obligations." One of her primary missions -- not just in Vienna but back at U.N. Headquarters -- is to persuade the international community that Iran is not adhering to those obligations, and to ensure that it does.

The trip comes as the Trump administration's war of words with Iran is ramping up. Iran's nuclear chief, Ali Akbar Salehi, issued an ominous warning on Tuesday that his country could, "if we make the determination… resume 20 percent-enrichment in, at most five days." Under the terms of the nuclear deal, Iran is banned from enriching uranium to that level, which can make it useable in nuclear weapons...

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