The Globe and Mail reports in its Wednesday edition that the United States' top trade official says he expects negotiations over the North American free-trade pact to ultimately result in separate arrangements with Canada and Mexico built on top of the existing trilateral agreement. The Globe's Mark Rendell writes that in an event on Tuesday in Washington, U.S. Trade Representative Jamieson Greer laid out his expectations for the review of the U.S.-Mexico-Canada Agreement. A key question heading into the review is whether the deal will survive as a trilateral pact, or be split into two separate bilateral agreements. President Donald Trump has called the agreement "irrelevant" and has mused about leaving it. "Our baseline is that things have to be changed," Mr. Greer said about the USMCA, but he suggested the core of the agreement would likely remain in place, while the U.S. would look to address specific bilateral grievances with Canada and Mexico in separate side agreements. The existing agreement has "a bunch of load-bearing pillars" that function well, Mr. Greer said. Over the past year, the Trump administration has placed sectoral tariffs on a range of industries, including steel, aluminum, cars and lumber.