US Trade Representative Ron Kirk says it is not necessary to renegotiate the North American Free Trade Agreement to honor a campaign promise by President Barack Obama to add stronger labor and environmental provisions.
Mr Kirk's statement on Monday is seen as the latest indication that Mr Obama will not press for a full-fledged renegotiation of the accord, despite complaints he made about it in last year's campaign.
During the campaign, Mr Obama said the United States should threaten to withdraw from NAFTA if Canada and Mexico did not agree to change it.
