Anchored by Jake Tapper, The Lead airs at 4 p.m. ET on CNN.
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(CNN) - Momentum appears to be building for a breakthrough deal on Iran's nuclear program, with top diplomats flocking to the site of ongoing talks and one Western official saying Friday a deal could be reached "as soon as tonight."
U.S. Secretary of State John Kerry and British Foreign Secretary William Hague will both be in Geneva on Saturday.