Iran’s top nuclear negotiator was heading back to Tehran on Sunday to consult with his nation’s leadership, as negotiators remained divided over how to limit and monitor Tehran’s nuclear program and even on how to interpret the preliminary agreement they reached two months ago.

President Obama's administration came to office with the world on fire. Confront and Conceal is the story of how, in his first term, Obama secretly used the most innovative weapons and tools of American power, including our most sophisticated—and still unacknowledged—arsenal of cyberweapons, aimed at Iran's nuclear program.

Confront and Conceal—with an updated epilogue for this paperback edition—provides an unflinching account of these complex years of presidential struggle, in which America's ability to exert control grows ever more elusive.