Here are the basics on why the president is complaining about the yet unopened border crossing.

Prime Minister Mark Carney says he spoke to Donald Trump following threats the U.S. president made to prevent the new Gordie Howe International Bridge between Ontario and Michigan from opening.

"I will not allow this bridge to open until the United States is fully compensated for everything we have given them, and also, importantly, Canada treats the United States with the Fairness and Respe...