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President Donald Trump renewed his threat to walk away from the North American Free Trade Agreement just as Canadian Prime Minister Justin Trudeau arrived in Washington on the eve of a new round of negotiations.

Trump told Forbes, in an interview published Tuesday, he thinks NAFTA will have to be terminated — as signals mount that the U.S. is putting potentially deal-breaking proposals on the table and as the top U.S. business group sounds the alarm.

The fourth round of talks starts today. The U.S. is expected to detail a proposal for the auto sector that would raise the minimum content requirement for parts sourced in the NAFTA region and in the U.S. specifically.

“I happen to think that NAFTA will have to be terminated if we’re going to make it good. Otherwise, I believe you can’t negotiate a good deal,” Trump said in the Forbes interview. He said that he considered it a “great accomplishment” to pull out of the Trans-Pacific Partnership trade pact, which included the three NAFTA countries, and that he favors bilateral pacts.

Meanwhile, hundreds of business leaders from all 50 states have joined forces to increase pressure on Trump to remain in NAFTA.