Foreign ministers from major powers were set Thursday to turn the screws on Iran to finalise a historic nuclear deal on the eve of a deadline to present it to US lawmakers. If the US Congress does not receive the text by early Friday morning Vienna time—midnight in Washington—it makes the approval process longer and potentially more problematic. But despite this pressure, and almost two weeks of talks in the Austrian capital, it is unclear whether an accord aimed at ending a 13-year standoff can be sewn up at all, let alone in time, AFP reports.