VIENNA—The White House is targeting Jewish groups in its latest push to blunt congressional criticism of an Iran deal that observers expect to be sealed in the coming days, according to a recording of a strategy conference call obtained by the Washington Free Beacon and experts familiar with the call. The White House’s liaison to the Jewish community on Monday advised dozens of progressive groups to push a poll commissioned and distributed by the liberal fringe group J Street, which has been defending a deal with Iran. Matt Nosanchuk, an official in the White House Office of Public Engagement, who...