The U.S. Chamber of Commerce and the National Association of Manufacturers - two powerful business lobbies both traditionally supportive of Republican candidates - took the highly unusual step of lashing out at presumptive GOP presidential nominee Donald Trump during his speech Tuesday that hammered U.S. free-trade deals. "Under Trump's trade plans, we would see higher prices, fewer jobs, and a weaker economy," the Chamber tweeted during the speech in Monessen, Pennsylvania, linking to an analysis that argues Trump's trade positions would throw the United States into an economic recession.