The deal with Iran could easily be reversed by the next president when Obama leaves office, causing any hope for a lasting impact to crumble.
Legislation passed in May will make it very difficult for the Republican-controlled Congress to reverse the president's deal with Iran — but that won't stop them from trying.
Israeli Prime Minister Benjamin Netanyahu reacted to the deal on Tuesday, saying that the "desire to sign an agreement was stronger than everything else.”
President Obama, in an early morning address, sought to strike a cautiously optimistic note while stressing that the Iran nuclear deal is “not built on trust, it’s built on verification.”
U.N. Secretary General Ban Ki Moon says the deal will lead to greater understanding and cooperation in the Middle East.
Iran and six world powers arrived at a deal Tuesday morning to limit the former's nuclear program in exchange for the suspension of sanctions.