Energy Secretary Dr. Ernest Moniz speaks to the media during the daily briefing in the Brady Press Briefing Room of the White House in Washington, Monday, April 6, 2015. President Barack Obama is casting the Iran talks as part of a broader foreign policy doctrine that sees American power as a safeguard that gives him the ability to take calculated risks.

Tough sell: Obama ramps up lobbying campaign on Iran deal

The White House deployed Energy Secretary Ernest Moniz – a nuclear physicist – to offer a scientific defense of a deal that Moniz said would…