Keystone XL pipeline will not use U.S. steel despite Trump's vow
"The way that executive order is written," Sanders said. "It’s specific to new pipelines or those that are being repaired. Since this one is already currently under construction, the steel is already literally sitting there; it would be hard to go back."

Keystone Pipeline - Wikipedia
In March 2012, Obama endorsed the building of the southern segment (Gulf Coast Extension or Phase III) that begins in Cushing, Oklahoma. The President said in Cushing, Oklahoma, on March 22, "Today, I'm directing my administration to cut through the red tape, break through the bureaucratic hurdles, and make this project a priority, to go ahead and get it done."[55]

The pipeline came to a greater prominence of attention when a planned fourth phase, Keystone XL, attracting growing environmental protest, became a symbol of the battle over climate change and fossil fuels, and in 2015 was rejected by then President Barack Obama.

So you don't believe Obamma signed off on the 2012 bill, without specifying US steel would be used, and you don't believe Obamma put a halt to the project in 2015...