Earlier this year, some trade supporters had predicted this week's APEC summit would bring a breakthrough on a comprehensive trade deal.

They had hoped that when the 21 global leaders met at the Asia-Pacific Economic Cooperation Summit, Obama would be able to use a smaller side meeting to conclude the Trans-Pacific Partnership, a trade deal involving the United States, Canada, Australia and New Zealand, as well as eight Asian and Latin American countries.

But the deal wasn't reached, and there's no telling when it will be.

"There are still significant divides that need to be bridged, especially between Japan and the United States," said Joshua Kurlantzick, a Southeast Asia expert with the Council on Foreign Relations.

The dream of a free-trade zone stretching from Asia to the Americas keeps getting tripped up by the stalemate over farm exports. The United States wants Japan to lower barriers to agricultural imports, including rice, pork, beef, dairy and sugar. But Japan wants to protect those sensitive food products.

The problems aren't just at the negotiating table — Obama also has a lot of political resistance to overcome at home. Many groups representing consumers and unions oppose the trade pact.

For example, Lori Wallach, a global trade expert for Public Citizen, a consumer watchdog group, said in a statement that TPP would "promote lower wages, higher medicine prices, more unsafe imported food, and new rights for foreign investors to demand payments from national treasuries."

At the same time, very conservative groups oppose any suggestion that House and Senate GOP leaders agree to renew "fast-track" negotiating authority for Obama.

Previous presidents have had that authority, which gave them the ability to complete a deal and then present it to Congress for a simple yes-or-no vote, with no amendments. But the White House hasn't had that ability for new deals since 2007, or for existing negotiations since 2011.

Obama wants Congress to renew the now-expired power, but Tea Party Nation President Judson Phillips and other conservatives put out a joint statement in opposition of "giving the president even more power to bypass Congress and enact his open borders agenda."

Whether Obama can put together a coalition of enough Democrats and Republicans to renew his trade-promotion authority in the new Congress is not yet clear.

"Any trade deal is hard to pass in the United States," but with Congress still so divided, a politically weakened Obama will have an especially tough time with TPP, Kurlantzick said.

President Obama said on Monday that he still sees success for the Asian trade deal.

"I just met with several other members of the TPP who share my desire to make this agreement a reality," Obama said. "We're going to keep on working to get it done."

Copyright 2016 NPR. To see more, visit http://www.npr.org/.