TransCanada Corp. opened one of the largest trade appeals ever brought against the United States, seeking to recoup $15 billion tied to the Obama administration’s rejection of the Keystone XL oil pipeline.

TransCanada Corp.’s request to pause a U.S. review of its Keystone XL oil pipeline gives President Obama a way to ease a political headache at home and help him repair frayed relations with Canada.

Truck driver Craig Huzulak is unemployed after losing his job four times since December — the new normal in a Canadian oil patch still reeling from a downturn.