Following over two weeks of intense talks, negotiators from Iran and the P5+1 group of countries reached an agreement over Tehran’s nuclear program in the Austrian capital of Vienna on Tuesday morning.
Obama addressed the American people from the White House after the official announcement of the conclusion of talks.
"Today after two years of negotiation the United States together with the international community has achieved something that decades of animosity has not,” Obama said with Vice President Joe Biden at his side.
The US president warned a skeptical Congress that “no deal means a greater chance of more war in the Middle East.”
The US Congress now has 60 days to review the nuclear agreement and vote to either approve or disapprove of the deal.
Obama said he would veto any legislation from lawmakers that "prevents the successful implementation of the deal."
The conclusion is viewed as the most significant foreign policy achievement for the Obama administration.
Iranian President Hassan Rouhani also commented on the agreement, saying “a new chapter has begun in relations with the world.”
He said the sanctions regime imposed on the Islamic Republic was never successful, adding that resistance of the Iranian nation guaranteed their victory in the nuclear talks.