The Canadian energy sector has proposed several major oil pipeline projects in the last decade, but only the Trans Mountain expansion project was completed.

US President Donald Trump said Monday he wanted to revive the Keystone XL oil pipeline, even though its developer has already walked away from the project.

Trump on Monday called for the revival of the Keystone XL pipeline, which would carry oil from Canada to the US. So why did he make contrary remarks on Tuesday?

The U.S. on Monday imposed sanctions on dozens of people and oil tankers across China, the United Arab Emirates, India and other jurisdictions for allegedly helping to finance Iran and its support for militant groups that launch attacks against the U.

Oil futures ticked slightly lower early Tuesday, a day after a fresh round of U.S. sanctions aimed at curtailing Iran’s crude exports provided a modest lift.

Oil prices were steady on Tuesday, after a bump the previous day when fresh U.S. sanctions imposed on Iran increased concerns that supply might tighten, as global refining margins remained strong. Brent crude futures were down 5 cents to $74.