Pro-Israel leaders on Monday expressed alarm over what they characterized as the Obama administration’s efforts to sow division among Jewish leaders in order to advance a policy that they say would permit Iran to cross the nuclear threshold. Rifts emerged between the leaders of four top Jewish groups over the weekend following an “intense” meeting last week with National Security Adviser Susan Rice and other top officials at the White House, according to several insiders. The Obama administration sought to enlist the pro-Israel leaders in their fight to delay Congress from passing a new round of Iran sanctions for at...