Iran nuclear issue about to ignite

"Trump is expected to overrule his top national security advisers and decline to certify the Iran nuclear agreement, ... a decision that would reopen a volatile political debate," write the N.Y. Times' Mark Landler and David E. Sanger:

• What's next: "By declining to certify Iran's compliance, Mr. Trump would essentially kick it to Congress to decide whether to reimpose punitive economic sanctions. Even among Republicans, there appears to be little appetite to do that, at least for now."
• Why it matters: "The strategy is an effort by the Trump administration to make the nuclear agreement only part of a multidimensional approach to pressure Iran on many fronts ... But the administration has yet to articulate that broader strategy. As a result, the nuclear deal remains ... a political football in Washington."