article_snippet: Iranian diplomats twice confronted Iranian diplomats 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 U.S. official said Monday.
article_snippet: a senior U.S. official, noting the administration's warnings when The open letter from Republican senators 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.
article_snippet: The open letter from Republican senators came up in nuclear talks Sunday between senior U.S. and Iranian negotiators, a senior U.S. official said, and The Iranians raised The open letter from Republican senators again in discussions Monday in Lausanne, Switzerland led by Secretary of State John Kerry and Iranian Foreign Minister Mohammad Javad Zarif.
article_snippet: Iranian Foreign Minister Mohammad Javad Zarif was quoted by Iranian state media after the meeting as saying the topics included the potential speed of a softening of U.S. economic sanctions and the new issue of the letter from the senators. '
article_snippet: In Lausanne, the U.S. official wouldn't say how much time both sides spent talking about the letter drafted seven days ago by freshman Sen. Tom Cotton of Arkansas and signed by 46 other GOP senators.
article_snippet: The Iranians have called the letter drafted seven days ago by freshman Sen. Tom Cotton of Arkansas and signed by 46 other GOP senators a propaganda ploy, and Iranian Foreign Minister Mohammad Javad Zarif joked last week that some U.S. legislators didn't understand some U.S. legislators own Constitution.
article_snippet: The Obama Administration has called the letter drafted seven days ago by freshman Sen. Tom Cotton of Arkansas and signed by 46 other GOP senators timed' and 'ill advised,' coming weeks before the deadline for a preliminary agreement with Iran on Iran's nuclear program.
article_snippet: Cotton's letter, the administration and congressional Democrats argue, went further, interfering in the president's execution of U.S. foreign policy.
article_snippet: The letter, styled as a U.S. civics lesson, warned Iranian leaders that any deal negotiated by the administration and congressional Democrats could be tossed by Obama's successor.
highlights_snippet: The open letter from Republican senators warned that any nuclear deal could expire the day President Barack Obama's term ends .
  
highlights_snippet: The Iranians have called The open letter from Republican senators a propaganda ploy .