iranian diplomats twice confronted their american counterparts about an open letter from republican senators who warned that any nuclear deal could expire the day president barack obama leaves office, a senior us official said monday the official, noting the administration's warnings when the letter first surfaced, said the gop intervention was a new issue in the tense negotiations facing an end of month deadline for an agreement to reduce iran's ability to produce a nuclear weapon in exchange for loosing western sanctions the letter came up in nuclear talks sunday between senior us and iranian negotiators, the official said, and the iranians raised it again in discussions monday in lausanne, switzerland led by secretary of state john kerry and iranian foreign minister mohammad javad zarif scroll down for video  us secretary of state john kerry, left, listens to iran's foreign minister mohammad javad zarif, right, before resuming talks over iran's nuclear program in lausanne, switzerland on monday  zarif was quoted by iranian state media after the meeting as saying the topics included the potential speed of a softening of us economic sanctions and the new issue of the letter from the senators 'it is necessary that the stance of the us administration be defined about this move,' he was quoted as saying kerry and zarif met for nearly five hours in lausanne, the start of several planned days of discussions most of the iranians then departed for brussels, where they were to meet with european negotiators in brussels, eu foreign policy chief federica mogherini said that 'we are entering a crucial time, a crucial two weeks' and german foreign minister frank walter steinmeier said that after 'more than ten years of negotiations, we should seize this opportunity' the united states and iran are plunging back into negotiations in a bid to end a decades long standoff that has raised the specter of an iranian nuclear arsenal, a new atomic arms race in the middle east and even a us or israeli military intervention  us secretary of state john kerry takes a break during a bilateral meeting with iranian foreign minister mohammad javad zarif over iran's nuclear program  'there are areas where we've made progress, areas where we have yet to make any progress,' british foreign secretary philip hammond said 'but the fact that we're all here talking shows the commitment on both sides to try to reach an agreement' in lausanne, the us official wouldn't say how much time the sides spent talking about the letter drafted seven days ago by freshman sen tom cotton of arkansas and signed by 46 other gop senators the iranians have called the letter a propaganda ploy, and zarif joked last week that some us legislators didn't understand their own constitution the obama administration has called the letter 'ill timed' and 'ill advised,' coming weeks before the deadline for a preliminary agreement with iran on its nuclear program in the end, the talks and a potential agreement depend on iran showing the world that its nuclear program is exclusively peaceful, said the us official, who briefed reporters only condition of anonymity the goal for a full agreement is the end of june us energy secretary ernest moniz, us secretary of state john kerry, iran's foreign minister mohammad javad zarif and the head of the atomic energy organization of iran ali akbar salehi, from left to right, pose for a photograph before resuming talks over iran's nuclear program  republicans argue that a deal would be insufficient and unenforceable, allowing iran to eventually become a nuclear armed state to that end, they've delivered a series of proposals to undercut or block an agreement, including ones that would require senate say so on a deal and order new sanctions against iran while negotiations are underway cotton's letter, the administration and congressional democrats argue, went further, interfering in the president's execution of us foreign policy the letter, styled as a us civics lesson, warned iranian leaders that any deal negotiated by the current administration could be tossed by obama's successor obama and other officials insist they're not going to make any deal that would allow iran to acquire nuclear weapons the agreement taking shape would limit iran's uranium enrichment and other nuclear activity for at least a decade, with the restrictions slowly lifted over several years from left, german foreign minister frank walter steinmeier, european union high representative federica mogherini, iran's foreign minister mohammad javad zarif and british foreign minister philip hammond stand for a group photo prior to a meeting in brussels on monday  washington and other world powers also would gradually scale back sanctions that have crippled the iranian economy tehran says it is only interested in peaceful energy generation and medical research, but much of the world suspects it harbors nuclear weapons ambitions kerry and zarif plan to regroup in lausanne on tuesday the us secretary of state is to return to washington by week's end for talks with afghanistan's leaders, and the iranians plan to break for the persian new year officials say talks might restart sometime next week, if necessary a deal would also require the approval of america's negotiating partners: britain, china, france, germany and russia with little time remaining before the end of march, some officials have said the persistent differences mean negotiators will likely settle for an announcement that they've made enough progress to justify further talks such a declaration would hardly satisfy us critics of the obama administration's efforts but the senior american official said the goal was to determine by the end of march 'if we can get to a political framework that addresses the major elements of a comprehensive deal'
republican barack obama iranian american switzerland us state john kerry mohammad javad zarif iranians
the open letter from republican senators warned that any nuclear deal could expire the day president barack obama's term ends . iranian diplomats confronted american counterparts twice at discussions sunday and monday in switzerland, a senior us official said . secretary of state john kerry and iranian foreign minister mohammad javad zarif to start several days of discussions . the iranians have called the letter a propaganda ploy 