Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: President Obama urged Congress to approve a historic nuclear weapons deal struck with Iran this week, threatening to veto any such legislation that would stop the agreement from going through. Obama spoke from the White House Tuesday morning after the deal was announced. Addressing skeptics of the agreement, Obama said, 'This deal is not built on trust. It is built on verification.' He said the nuclear agreement ensures that Iran 'will not develop a nuclear weapon' by cutting off every path to building one. 'This deal demonstrates that American diplomacy can bring real and meaningful change,' the president said.The president spoke from the White House Tuesday morning on the historic deal struck with Iran to suspend the country's nuclear weapons programHe urged Congress to approve the deal, while threatening to veto any bill that would stop the agreement from being put in place 
 Question:Coming to a diplomatic resolution over Iran's nuclear weapons program may also lead to better relations with _ in the future, the president said.

Iran