Trump's tariff moves have caused a gaping wound in the decades-old North American trade partnership, have also caused the stock market to sink and alarmed U.S. consumers.

In another reversal, Trump postponed for a month new tariffs on imports from Canada and Mexico that fall under the three nations' free trade deal.

The on-again, off-again tariffs and the high-level discussions surrounding them have exasperated negotiating teams, according to Mexican officials and Canadian sources.