The embattled US dollar is expected to come under scrutiny at a summit of developing and industrialized nations following China-led calls to review its role as a reserve currency. The dollar issue is bound to surface at the two-day meeting in Pittsburgh as US President Barack Obama and other leaders of the Group of 20 economies debate a new framework for tackling the so called global "economic imbalances" blamed for fuelling the latest financial crisis. "Though not clear how the plan would be enforced, it would involve measures such as the US cutting its deficits and saving more, China reducing...