Iran's Missile Program Serves Self-Defense Purposes: Zarif

United Nations Secretary General António Guterres

Under the deal struck by Obama and other world leaders, Iran agreed to roll back its nuclear program - long suspected of being aimed at developing atomic weapons - in return for billions of dollars in sanctions relief.

"We do expect to be implementing new sanctions" related to missiles and Iran's "fast boat program", the official said but declined to specify what the measures would be.

Monday, Trump's administration certified to Congress that Iran is technically complying with the landmark 2015 nuclear deal - but noted that the country "remains one of the most risky to US interests and regional stability".

Mr. Tillerson and Mr. Trump intend to emphasize that Iran "remains one of the most risky threats" in the region, a senior official said.

The U.S. said Iranian military advances in the Mideast and alliances with insurgent groups in the region "are serving to undercut whatever "positive contributions" to regional and worldwide peace and security were meant to emerge" from the 2015 nuclear pact.

Among the options Trump discussed with Tillerson and other aides was to extend the sanctions relief but refuse to certify Iran's compliance, several officials said.

During his run for the White House, Trump called the Iran nuclear pact supported by his predecessor, former President Barack Obama, as "the worst deal ever negotiated".

The U.S. needs to certify to Congress every 90 days that Iran is complying with the deal, and the last time it did so was in April. They include "atrocities by the Assad regime" that Iran supports in Syria, "continuing hostility to Israel" and other actions, as well as its missile program and terrorist support.

Both Democrats and Republicans in Washington have insisted on responding to Iran's provocative ballistic missile tests for months, but reportedly waited until after the recent Iran election to vote on this legislation.

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Asked if the administration wants to see regime change in Iran, one official said: "We're looking for a change in the regime's behavior".

Trump denounced the deal during his campaign and promised to renegotiate it and get tough on Iran.

"We receive contradictory signals", Zarif added.

Read: Two Years Later, Where Does The Iran Deal Stand? .

Top among the list of concerns today are improved Iranian missile capabilities, support for the Syrian government, human rights abuses and the detention of Americans.

Prior to the announcement, Trump met with senior security advisors including Secretary of State Rex Tillerson, Defense Secretary Jim Mattis, National Security Advisor Lt. Gen. H.R. McMaster and the Chairman of the Joint Chiefs of Staff Joseph Dunford, the New York Times reported. "It has also been more than a decade since Robert Levinson disappeared from Iran's Kish Island".

"Well, we've taken a route that has been prescribed within the nuclear deal..."

THE WEEKLY STANDARD reported last week that the White House had made a decision to recertify Iranian compliance with the terms of the 2015 deal negotiated between the Obama administration and the Iranian government (cumbersomely known as the Joint Comprehensive Plan of Action, or JCPOA).