U.S. Congress calls for hard line on Iran sanctions

WASHINGTON (Reuters) - U.S. lawmakers urged President Barack Obama to keep to a hard line on sanctions imposed on Iran on Monday, a day before the resumption of talks on its nuclear program between world powers and Tehran.

Congress has generally been tougher on Iran than the Obama administration, pushing for ever-stricter economic measures over Tehran's nuclear program. On Monday, both Democrats and Republicans called for Obama to stand firm, even as an administration official held out the possibility of quick sanctions relief if Tehran moves quickly.