Unions blame job losses on trade deals like NAFTA signed under Bill Clinton. But President Obama argues one he's trying to strike with Pacific Rim countries is different, and it's dividing his party.
Congress is giving President Obama new powers to help seal the deal on an ambitious Asia-Pacific free trade agreement, a move that angers many Democrats and unions.
Labor groups, which have been allies of President Obama, are now stepping up their efforts to thwart White House plans for passing foreign trade deals on a "fast track" through Congress.
The trade agreement has helped the U.S., Mexico and Canada sell a lot more food to one another. That's meant more seasonal produce for the U.S., and more processed food and supermarkets for Mexico.
President Obama is pushing for massive trade deals with Asian and European nations. Critics say the trade negotiations, which are conducted in private, aren't facing enough scrutiny.