Attorneys general from 21 states are suing to overturn President Joe Biden's cancellation of the contentious Keystone XL oil pipeline from Canada

Opponents of other pipelines hope projects they’ve been fighting will be next.

The Trump administration is asking the U.S. Supreme Court to revive a permit program that allows new oil and gas pipelines to cross waterways with little review

The issue stems from new legislation meant to punish "riot boosting."

A segment of the Keystone pipeline was shut down in early February.

The company said the pipeline was shut down at 6 a.m.

The White House announced today it has signed off on the Keystone XL oil pipeline, authorizing the Canadian company behind the project to begin construction.

The White House announced today it has signed off on the Keystone XL oil pipeline, authorizing the Canadian company behind the project to begin construction.

The actions drew applause from pipeline supporters, condemnation from opponents.

President Trump touted the potential economic impact of the pipelines.

President Trump used his fifth day in office to move forward the Keystone and Dakota Access pipelines, as well as to streamline regulations for infrastructure and manufacturing.