THE MOST FREE TRADE PRESIDENCY EVER:

The U.S. is negotiating a trade deal that's worth $38.5 trillion and spans 50 countries -- and most people have never heard about it.

The Trade in Services Agreement (TiSA) has been in the works since April 2013 and it could soon become America's most important trade deal.

That's because services -- everything from tourism, to communication and finance -- are increasingly important for the U.S. economy. They account for three quarters of the GDP and four out of every five jobs in the U.S., according to official statistics.

Unlike in its trade of goods, the U.S. has a big surplus in services trade, meaning it exports a lot more than it imports. This surplus reached $262 billion in 2015.

The Office of the United States Trade representative said the 50 nations deal could help create more jobs and make the U.S. richer.

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