But critics, especially those from Michigan and the industrial Midwest, argued that the deal does too little to address currency manipulation in some Asian countries, which can keep those countries' autos and other products artificially less expensive while increasing the price of American goods.

While a fact sheet on the deal from the White House said the Trans-Pacific Partnership eliminates import taxes, which in some cases have been as high as 70% on American automotive products exported to those nations, it failed to mention currency at all. A provision was added to a bill earlier this year saying that addressing unfair currency practices was a "principal negotiating objective," though it did not mandate the practices being part of the deal. The White House said that would hurt the deal's chances of being completed.

Ziad Ojakli, Ford's group vice president for government and community relations, recommended Congress reject the TPP in its current form.

"Ford supports free-trade agreements that result in real market openings and a level playing field for all to compete," he said. "Within the U.S. Congress, there is bipartisan consensus that currency manipulation needs to be meaningfully addressed. This summer, U.S. lawmakers took unprecedented action to set a clear negotiating objective for addressing currency manipulation in all future trade deals. The TPP fails to meet that test."