The Trans-Pacific Partnership negotiations are going down to the wire.
Representatives for the 12 nations involved had hoped to wrap up a deal in just two final days of talks in Atlanta. But the negotiations have been extended by three days.
The two big sticking points are dairy and medicines.
The negotiations were complicated by a debate over how long pharmaceutical companies should have exclusivity on their new drugs before rival companies can make similar generic products.
The United States, Canada and Japan have also been trying to limit the access for dairy producers into their markets.
Even if a deal is secured this week there are big question marks over whether US President Barack Obama can muster enough support in Congress to win approval for the deal.
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