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WASHINGTON (Reuters) - Canada’s top trade negotiator joins her Mexican and U.S. counterparts in Washington on Tuesday in a bid to remain part of a revamped trilateral North American trade pact, as U.S. officials expressed optimism a deal could be reached this week.

But Ottawa will be under pressure to accept new terms on autos trade, dispute settlement and intellectual property rules after the United States and Mexico agreed on Monday to overhaul the North American Free Trade Agreement (NAFTA).

U.S. President Donald Trump warned he could proceed with a deal with Mexico alone and levy tariffs on Canada if it does not come on board with the revised trade terms.

A spokesman for Canadian Foreign Minister Chrystia Freeland, who arrived in Washington on Tuesday for the talks, said Canada would only sign a new agreement that is good for the country.

Freeland rejoins the year-long talks following a hiatus of several weeks as the United States and Mexico ironed out bilateral differences in the renegotiation of the 24-year-old accord.

They have agreed on several provisions that Canada opposes, making it harder for Freeland to win concessions from U.S. Trade Representative Robert Lighthizer.

“I think he’s going to sit there with his arms folded a lot,” said Dan Ujczo, a Columbus, Ohio-based trade lawyer who focuses on U.S.-Canada issues. “It’s not going to be a positive discussion this week.”

U.S. Treasury Secretary Steven Mnuchin told CNBC on Tuesday that he believed the United States could also reach a trade deal with Canada this week.

“The U.S. market and the Canadian markets are very intertwined,” Mnuchin said. “It’s important for them to get this deal and it’s important for us to get this deal.”

Mexican Foreign Minister Luis Videgaray told

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