Some U.S. negotiators reportedly appear uncomfortable with the requests they are making in talks regarding the North American Free Trade Agreement (NAFTA).

"They don't like what they are doing," a source told Canada's CBC News.

There is also confusion about what the U.S. wants from the negotiations, the news outlet reported.

According to CBC, the demands presented by the U.S. delegation came from the Trump administration.

Mexico and Canada have vowed to continue work on NAFTA after an unproductive fourth round of negotiations in Washington.

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Canadian Prime Minister Justin Trudeau flew to Mexico City last week to meet with Mexican President Enrique Peña Nieto after the talks in Washington. The two world leaders committed to continuing negotiations on NAFTA.

"As we move forward with renegotiations, we will continue to work toward our shared goal of a win-win-win agreement to ensure that the new provisions are fair and beneficial to all three countries involved," Trudeau said last week.

"We are pleased to be talking about ways we can improve NAFTA," he said. "We will discuss those proposals, we will counter those proposals and we will take seriously these negotiations."

President Trump has repeatedly criticized the agreement, calling it the "worst trade deal ever made."

Trump earlier this month again floated the possibility that the U.S. may terminate the agreement.

"It's possible we won’t be able to make a deal and it’s possible that we will," Trump told reporters at the White House.

"But we’ll see if we can do the kind of changes we need."