OTTAWA — With only days before the first round of tariffs take effect, Canada’s allies in Washington, D.C., are pushing for U.S. President Donald Trump to permanently rescind the measures, arguing a trade war would cause economic harm on both sides of the border.

Little about how Trump discusses tariffs is normal — not only because he threatens tariffs on a weekly, even daily, basis, but also because it's often unclear if or when those tariffs will happen.