Donald Rumsfeld, one of the architects of the U.S. attack on Iraq, seems to have given little thought to the history-changing decisions he made, says the director of a documentary about the former U.S. secretary of defence.

"There's a level of responses to questions that is so deeply strange — unreflective, uninformative. To me, it's the most surprising aspect of this movie, The Unknown Known," said documentary filmmaker Errol Morris, who screened the film this week at the Toronto International Film Festival.

Speaking with Day 6 host Brent Bambury on CBC Radio, Morris said Rumsfeld was charming and avuncular — in contrast to a scowling Robert McNamara​, another former U.S. secretary of defence and the subject of Morris's Academy-award winning 2003 documentary The Fog of War. But Rumsfeld's charm "wears a little bit thin," Morris said.

Morris believes Rumsfeld's legacy has changed how Americans think about going to war.   

“I believe it is wishful thinking to imagine that the Bush administration just came to an end with the election of Barack Obama," said Morris, who lives in Boston. "Many of the policies of the Bush administration are still with us, the attitudes of the Bush administration are still with us. We live in a Rumsfeld world.”

Click on the link to hear the complete interview.