South Bow Corp. shares posted their biggest single-session gain in more than a month on the Toronto Stock Exchange after President Donald Trump said a trade deal with Canada could involve reviving the Keystone XL pipeline. Trump said he had paused 50% tariffs against Canada for three days while documents for a deal were finalized and wrote that the pipeline may be revived, without providing details. The original project was designed to carry crude from Alberta’s oil sands to U.S. Gulf Coast refineries, but President Biden revoked its presidential permit on Jan. 20, 2021. Developers are now piecing together an alternative supply line, and Trump has signed support for the project, including an April 2026 presidential permit for Bridger Pipeline LLC to cross the border in Montana. The alternative is part of a trio of proposed pipelines intended to move heavy oil from western Canada to Gulf Coast refineries equipped to process it. TC Energy later spun off its liquids pipeline operations, with South Bow inheriting parts of the partially built Keystone XL infrastructure. South Bow is developing the 465,000-barrel-per-day Prairie Connector, backed by 20-year binding shipper commitments and targeting a final investment decision by mid-2027, subject to stable U.S. permitting and additional cross-border connections. South Bow said last year that it had moved on from the Keystone XL project.