Meng's defence says the case is really about the United States seeking to enforce its Iranian sanctions laws against her for conduct that took place outside both the United States and Canada.

U.S. President Donald Trump's administration has said it is open to negotiations with Iran on a more far-reaching agreement on nuclear and security issues.

Congress is not expected to approve new sanctions until January at the earliest, giving President Barack Obama at least a few more weeks before his diplomatic effort could face added complications.