As a candidate, Mr.Obama said he favored renegotiating parts of the North American Free Trade Agreement, and criticized other trade pacts as lacking environmental and labor provisions.

• 在竞选时，奥巴马说，他赞成就北美自由贸易协定的部分条款重新进行谈判，他批评其他贸易条约没有列出有关环境和劳工问题的条款。