As US secretary of state Marco Rubio heads to the Gulf to defend Washington's proposed peace deal with Iran, one provision has emerged as a major source of concern among America's Arab allies -- a planned $300 billion reconstruction and development fund for Tehran.

DUBAI — At the heart of the deal to end the Middle East war lies a $300 billion fund to rebuild and develop Iran — but so far it is unclear who wil...

The text does not say who will contribute to the fund; Saudi FM stresses rebuilding trust "before any concept of economic cooperation".