The Globe and Mail reports in its Saturday edition that every journey starts with a first step, and American politics is finally delivering some overdue baby steps against President Donald Trump's trade policies. The Globe's Tony Keller writes that most of the tariff burden on Canada -- sectoral tariffs on steel, aluminum and other goods -- falls under a law that was not at issue in this case, and whose use appears to be constitutional. As for the tariffs struck down by the court, Mr. Trump says he can quickly reimpose them by other means. That leaves Canada facing the existing suite of sectoral tariffs, threats of new tariffs and an across-the-board 100-per-cent tariff on all Canadian exports. But cracks are starting to show. This month has brought the first signs of pushback from his own side against his trade policies and autocratic approach. The Constitution gives Congress the power of the purse, the same as our Parliament. A tariff is clearly a tax; levying taxes is Congress's job. Mr. Trump has spent the past year acting as if Congress has given him a blank cheque, but with midterm elections looming, dozens of Republicans in Congress now have reason to worry that Mr. Trump's actions could cost them their seats.