By Timothy Cama and Devin Henry

March 21, 2017 - The White House has delayed the release of an executive order on climate change, two sources told The Hill on Monday.

President Trump was expected to sign his long-awaited order on Monday, beginning the process of rolling back major Obama-era climate change policies and fulfilling key campaign promises.

But that order could now come next week instead, the sources said.

The timing of the executive order has been up in the air for weeks as the White House mulls what exactly to include in the plan.

Trump is expected to instruct the Environmental Protection Agency (EPA) to begin the process of ending the Clean Power Plan, Obama's signature climate measure. The order is likely to lift a moratorium on new leasing of coal mining on public land, and could take aim at other climate measures crafted by the Obama administration.

When the order comes out it will kick up significant opposition from Democrats and environmentalists, who have promised to fight for the preservation of Obama's climate work.