The U.S. should revive the Trans-Pacific Partnership (TPP) as the deal is the most "important geopolitically" for the U.S., the country's former ambassador to China said.

"There's nothing more important than resurrecting, bringing back the TPP. That's probably the best economic complement we can come up with in the U.S. to deal with South China Sea issues (involving) China," said Max Baucus, the Obama administration's envoy to China from 2014 to January 2017.