The EPA will propose repealing the Clean Power Plan and plans to solicit input on a rule to replace it, Reuters reports, citing an internal EPA document.

The proposed rule would make good on President Donald Trump's campaign pledge to unravel Obama's efforts to curb global warming.

"We can't comment on the authenticity of the document, but what we can say is that the Obama Administration pushed the bounds of their authority so far that the Supreme Court issued a stay - the first in history - to prevent the so-called "Clean Power Plan" from taking effect", said EPA spokeswoman Liz Bowman.

The Clean Power Plan now is suspended by the D.C. Circuit Court of Appeals, which set a deadline of Friday for a status report from the EPA on how it plans to proceed.

Industry sources following the rulemaking process expect the proposal to repeal and replace the Clean Power Plan to be released as soon as the end of this week. While the Obama White House directed agencies to consider global climate impacts as a part of their social cost of carbon measurement, the Trump White House has told them to focus only on impacts within US borders.

"The agency now intends to issue what it calls an Advanced Notice of Proposed Rulemaking to solicit input as it considers 'developing a rule similarly meant to reduce Carbon dioxide emissions from existing fossil fuel electric utility generating units'".

Under the rule, the federal government set reduction carbon targets for states and then asked them to find ways to hit those targets on their own, rather than by regulating a single source of pollution.

In the 43-page document, the EPA said the Clean Power Plan (CPP) introduced by former President Barack Obama in 2015 was illegal.

The Obama administration designed the Clean Power Plan to lower carbon emissions from existing power plants by 2030 to 32 percent below 2005 levels.

The so-called "fenceline provision" was a key argument that CPP critics, including Pruitt, used to challenge the regulations in court past year.

But the EPA is now set to say that a regulation affecting the broader electricity sector is outside the agency's purview.

The EPA said it has not yet determined whether or when it will propose a new rule to regulate emissions from existing power plants.

Pruitt, as Oklahoma's attorney general, made a career fighting EPA safeguards and was part of a coalition of state attorneys general that tried to block implementation of the CPP. Conservative groups have expressed frustration that Pruitt has not moved to dismantle the rule already, and the administrator has shown appetite for the fight before, signing on to a legal challenge in 2012.