We can't win war: Clinton

Democrat Hillary Clinton charged on Monday the Iraq war may end up costing Americans $1 trillion and further strain the economy, as she made her case for a prompt US troop pullout from a war "we cannot win."

This week marks the fifth anniversary of the US invasion of Iraq, but voters now say the economy is their top issue.

Clinton, the former first lady who is trying to convince voters she has foreign policy gravitas, criticized both her rival for the Democratic presidential nomination, Illinois Senator Barack Obama, and the Republicans' choice, Arizona Senator John McCain.