Negotiations over the Trans Pacific Partnership (TPP) are heading into their final, and most difficult, stage, trade officials told Iowa Farm Bureau members recently.

"Right now, we are in the end game of the TPP. And like all end games, this is where it gets tough," said Sharon Bomer Lauritsen, assistant U.S. trade representative for agricultural issues.

But despite the difficulties, U.S. trade officials are optimistic that the deal can be struck to complete the proposed trade agreement that would connect the Unit­­ed States in a free trade zone with countries in Asia and South America, as well as...