"Incorporating currency provisions in the agreement will strengthen our ability to combat these unfair trade practices and help to create a level playing field for American workers, businesses and farmers."
Mr. Paul praised the signers of the letter for their bipartisan effort.
"These members have sent a clear message to President Obama that trading partners like Japan must open their markets and stop manipulating their currency if they want to join the Trans-Pacific Partnership," he said.
Earlier this week, the AAM sent its own letter to President Obama urging him to get tough with Chinese President Xi Jinping on predatory Chinese trade practices.
In 2012, the U.S. trade deficit with China reached a record $315 billion, a level of deficit that the Economic Policy Institute (EPI) claims cost the U.S. 2.7 million jobs between 2001-2011.
The nation's trade deficit in tires alone last year was $7.68 billion. China alone accounted for about $2.3 billion of that in car, light truck and medium truck tires.
The AAM is a non-profit, non-partisan partnership formed in 2007 by some of America's leading manufacturers and the United Steelworkers to explore common solutions to challenging public policy topics such as job creation, infrastructure investment, international trade, and global competitiveness