Do Americans support the Iran deal?

Both polls by the Washington Post/ABC News survey and the nonpartisan Pew Research Center found Americans are disapproval of the recent nuclear deal with Iran.
A large majority of Americans are skeptical of whether it will work.
In the Pew survey, just short of three-quarters of Americans said they had little or no confidence that “Iran’s leaders would uphold their side.” In the Post/ABC poll, about two-thirds voiced considerable skepticism about whether the agreement would succeed in preventing Iran from getting a nuclear weapon.
Republicans in both surveys were far more skeptical and much more likely to disapprove of the agreement than were Democrats or independents.
The Post/ABC survey was conducted July 16-19 among a random national sample of 1,002 adults and has a margin of error of plus or minus 3.5 percentage points. The Pew survey was conducted from July 14, the day the agreement was announced, through July 20. It involved a random national sample of 2,002 adults.