President Trump is expected to overrule his top national security advisers and decline to certify the Iran nuclear agreement, according to people who have been briefed on the matter, a decision that would reopen a volatile political debate on Iran but is likely to leave in place the landmark deal negotiated by the Obama administration.

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.

Five former members of President Obama’s inner circle of Iran advisers have written an open letter expressing concern that a pending accord to stem Iran’s nuclear program “may fall short of meeting the administration’s own standard of a ‘good’ agreement” and laying out a series of minimum requirements that Iran must agree to in coming days for them to support a final deal.

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.