The Japanese officials say they were surprised to learn that they had negotiated a deal with only the United States.
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The federal New Democrats say that if elected to govern, they won't feel bound to honour a landmark international trade pact the Conservatives could sign on to this week.
Stephen Harper's rivals say they have not been consulted on a possible trans-Pacific trade deal to be struck with 11 other countries.
NDP Leader Tom Mulcair says Stephen Harper, as usual, is doing things behind closed doors.
The prime minister says Trans-Pacific Partnership negotiations, which failed to reach an agreement late last week, are still ongoing, and Canada remains at the table, notwithstanding the dissolution of Parliament.
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