In private call, Mark Kirk personally attacks Obama officials and U.S. diplomats willing to halt new Iran sanctions  During an invitation-only phone briefing for supporters, one of the Senate’s top Iran hawks relished his battle with the Obama administration over the imposition of more sanctions against Iran amid the latest round of diplomatic negotiations underway in Geneva. During the call, Sen. Mark Kirk, R-Ill., reserved special attacks for Secretary of State John Kerry and lead U.S. negotiator Under Secretary of State Wendy Sherman.