Mr. “Art of the Deal,” President Trump has a proven track record of undermining his negotiating positions with both America’s friends and foes. He is an untrustworthy deal maker whose word on behalf of the United States cannot be relied upon in a negotiation or complying with an agreed upon deal.

That is why on Aug. 22 Canadian Prime Minister Mark Carney, in walking away from tariff negotiations with Trump, observed that “We’ve recognized from the start that America has changed. We recognize that sometimes, its signature was written in pencil.”

“Written in pencil” refers to Trump signing an agreement that he may later disregard, erase, or alter on a whim.

On Nov. 13, 2018, Trump renegotiated the 1994 North American Free Trade Agreement replacing it with the new United States-Mexico-Canada trade agreement. Thereafter, Trump ignored commitments made under that new agreement by threatening and raising tariffs on Canadian, as well as Mexican, goods........

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