The pipeline’s operator, TransCanada, is struggling to track down oil producers and refiners who want to invest in transporting crude oil from Canada to the United States.

This follows a decade-long fight to construct Keystone XL’s northern leg, which finally got President Trump’s OK in March.

Lately, crude oil hasn’t looked like a great investment. When TransCanada proposed the pipeline extension in 2008, a barrel of crude cost $130. Now it’s down to $45, largely due to U.S. shale development and a glut of crude oil in the market.

The Wall…