The U.S. Mission to the United Nations says Ambassador Nikki Haley will use a news conference Thursday to “outline Iran’s ongoing destabilizing activities in the Middle East” and elsewhere in the world.

Haley will be discussing a U.N. report on the implementation of the nuclear agreement Iran struck with the United States, Britain, China, France, Russia and Germany, which also calls on Iran to not carry out ballistic missile activity that could carry nuclear warheads.

An advisory issued ahead of Haley’s remarks said she would give “irrefutable evidence” that Iran has not lived up to its international obligations and has tried to cover up its actions.

U.S. President Donald Trump has objected to the nuclear deal, which his predecessor Barack Obama championed as the best way to ensure Iran does not develop nuclear weapons. Both administrations object to Iran’s ballistic missile tests, while Iran says that it has not worked to develop nuclear weapons and has the right to work on missiles as part of its defense.

In a report to the U.N. Security Council, Secretary-General Antonio Guterres urged the United States to maintain its commitments under the nuclear agreement and “consider the broader implications for the region before taking any further steps.” He also called on Iran to “carefully consider the concerns raised by other participants in the plan.”

The United States and Saudi Arabia accuse Iran of arming Houthi rebels in Yemen, including missiles the fired at Saudi Arabia in July and November.

Iran denies sending weapons to the Houthis.

Guterres said in his report the U.N. is investigating the allegations, and that while examinations of the missile debris “suggest a common origin,” U.N. officials are still analyzing the information.

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