As Barack Obama weighs whether or not to send more troops to Afghanistan, there are questions as to whether the US approach in the war-ravaged country is actually working.

US involvement in Afghanistan dates back to 1979. That is when then-president Jimmy Carter approved a series of covert operations to support local fighters against the Soviet invasion.

One of the architects of that programme was national security adviser Zbigniew Brzezinski.

Al Jazeera's Josh Rushing sat down with him to get his take on the war, and why he thinks the United States made a grave error during the Afghan elections.