President Trump’s promised tariffs on softwood lumber risk disrupting the supply chain for something nobody wants to be caught without: toilet paper….While Trump advocates for new tariffs partly to bolster US manufacturing, they may also hit the availability of northern bleached softwood kraft pulp, or NBSK, a key component in making toilet paper and paper towels. NBSK constitutes about 30% of standard U.S. bathroom tissue and half of a typical paper towel, and is currently sourced primarily from Canada, said Brian McClay, chairman of TTOBMA. He added that the U.S. imported about 2 million tons of Canadian NBSK last year, highlighting the longstanding reliance of American paper-goods producers on pulp from their northern neighbour. …“If Canadian pulp mills close because they don’t have the fibre supply, I can’t think of any other option for them — they just can’t switch the recipe around,” he said. The scenario risks reviving painful memories of pandemic-era toilet paper shortages.