While oil producers in Canada and North Dakota are expected to benefit from a quicker route for crude oil to U.S. Gulf Coast refiners, a revival of the projects would mark a bitter defeat for Native American tribes and climate activists, who vowed to fight the decisions through legal action.

Trump campaigned on promises to increase domestic energy production and before taking office indicated he supported completion of the Dakota pipeline and re-starting the C$8 billion ($6.1 billion) Keystone XL project, which was rejected in 2015 by then-President Barack Obama.

Protesters had rallied for months against plans to route the $3.8 billion Dakota Access Pipeline beneath a lake near the Standing Rock Sioux reservation, saying it threatened water resources and sacred Native American sites.

It is not yet clear how exactly the orders will move the projects forward.

In a statement, the Standing Rock Sioux said they would fight the decision.

"Americans know this pipeline was unfairly rerouted towards our nation and without our consent. The existing pipeline route risks infringing on our treaty rights, contaminating our water and the water of 17 million Americans downstream," said Dave Archambault II, chairman of the Standing Rock tribe.

The North Dakota Petroleum Council, the trade group for the state's oil producers who are relying on Dakota Access to expand their crude transport options, cheered Trump's order.

"We think this is a great step forward for energy security in America," said Ron Ness, the council's president.

The more than 800,000 bpd Keystone XL pipeline linking Canada's oil sands to the U.S. Gulf Coast was conceived nearly a decade ago. Since then, however, the U.S. shale revolution has redefined oil flows, with domestic refiners suddenly finding themselves awash with plentiful supply and needing fewer foreign imports.