Activity is swirling about a potential rewrite of the North American Free Trade Agreement with President Trump’s announced preliminary trade deal with Mexico. But, as U.S. negotiations with Canada continued on Sept. 5, it was still unclear whether that country also would be part of the pact.

There appeared to be no change on a separate but related trade matter that is probably the most important for the construction industry: steep U.S. tariffs on steel and aluminum imports from Canada and Mexico, and retaliatory measures imposed by those two countries against the U.S.