Steel pipe is a vital part of America’s infrastructure, but it is also under attack from President Donald Trump, who has vowed to stop the pipeline if he wins the presidency.
The Keystone XL would be the second and most controversial pipeline project that Trump has vowed would not get completed.
It would stretch from Canada’s Alberta oil sands to refineries on the Gulf Coast, a crucial segment of the US’s crude oil infrastructure.
The pipe was developed by the giant US steelmaker, American Steel and concrete producer Arch, but has seen several setbacks since Trump took office in January.
The pipe has to pass through multiple hurdles including environmental reviews and multiple regulatory hurdles that have been blocked by a number of states, the Obama administration and even Congress.
“I’ve had a chance to see a lot of the Keystone pipeline in operation in Canada and it’s just a really big, ugly mess,” said Richard D’Amico, an environmental policy expert at the Center for American Progress, a think tank that advocates for policies to combat climate change.
“You’re going to have a big mess and that’s not going to be fixed by Trump.
It will be fixed with the Republican Congress and they’re going and they’ll get the infrastructure, they’ll make sure it’s built correctly.”
The Keystone pipeline would carry crude oil from Canada to refiners on the gulf coast, but environmentalists say the project is a huge threat to the environment and the US economy.
Keystone XL is the biggest oil pipeline in the world.
Keystone is now the second-largest pipeline project in the United States, after the controversial Dakota Access Pipeline that runs through North Dakota.
The pipeline would also be built through the heart of the country, through Texas and into Nebraska.
The project would cross through three states and pass through some of the most environmentally sensitive areas on the planet.
It has faced opposition from Native Americans and the Standing Rock Sioux Tribe, which say it is a threat to their water supplies and sacred sites.