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The International Longshore and Warehouse Union said 82 percent of its members voted in favor of ratification.
Trade Promotion Authority gives the White House more freedom to negotiate major free trade agreements with Pacific Rim and European partners.
Trade Promotion Authority, a bill that grants the president authority to conclude trade deals without congressional interference, moved forward in the Senate Thursday morning.
Cuba has pent up demand for trade and U.S. companies are eager to tap a new export market.
The Senate approved another short-term extension to continue funding highway, bridge and transit projects.