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If Iran does not take steps in the near future to live up to its obligations, then the United States will not continue to negotiate indefinitely... Our patience is not unlimited.

Barack Obama's speech on the meeting of the P5 plus 1 regarding Iran, obamawhitehouse.archives.gov. October 1, 2009.
If Iran does not take steps in the near future to live up to its obligations, then the United States will not continue to negotiate indefinitely... Our patience is not unlimited.