Washington, Jan 7 : Outgoing US national security adviser Stephen Hadley has said that Iran is the biggest challenge President-elect Barack Obama will face in the Middle East and adds that the next administration's top priority should also be aimed at stabilizing an increasingly volatile Pakistan.

He further said that more sanctions would be needed to force Tehran to forgo its nuclear ambitions and support for extremists.

Lahore, May 30 : US President’s National Security Adviser Stephen Hadley has assured Pakistan’s National Security Council Secretary Tariq Aziz that the US would continue to support President Pervez