Anchored by Jake Tapper, The Lead airs at 4 p.m. ET on CNN.
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(CNN) - President Barack Obama spoke by telephone with Iranian President Hassan Rouhani, the first direct conversation between leaders of the United States and Iran since 1979.
Obama believes a comprehensive agreement is possible regarding Iran's nuclear ambitions, telling reporters at the White House that "the test will be meaningful, transparent and verifiable action" and if proven would ease international sanctions in place against Iran.