Democrats, environmentalists blast idea US could leave the Paris accord

Trump's likely decision has been condemned by environmental groups.

An official who spoke to ABC News about Trump's likely decision cautioned that nothing is final until the president announces it, and that the White House is now working out a way to roll out and explain the reasons behind his decision.

"Pulling out of #ParisAgreement is a massive moral, economic & leadership failure for Trump admin. Loss of business, jobs, & intl standing," Markey wrote.

"President Trump’s decision to pull the United States out of the Paris Climate Accord is a stunning abdication of American leadership and a grave threat to our planet’s future," Pelosi wrote. "In walking away from this agreement, the President is denying scientific truths, removing safeguards that protect our health and our environment, protecting polluters and their dirty energy agenda, and threatening our national and global security."

Michael Brune, executive director of the Sierra Club, a prominent environmental advocacy group, released a statement saying that "our grandchildren will look back on with stunned dismay at how a world leader could be so divorced from reality and morality" in response to Trump's likely decision.

Rhea Suh, president of the Natural Resources Defense Council, an environmental law advocacy group, called the likelihood of Trump's decision a wrong turn.

“If true, it is a reckless and foolish mistake, and our kids will pay the price," Suh wrote on Twitter.

And Elon Musk, CEO of Tesla and SpaceX, said Wednesday he'll step down from Trump's advisory councils if he decides to withdraw from the Paris climate agreement.

"Don't know which way Paris will go, but I've done all I can to advise directly to POTUS, through others in WH & via councils, that we remain," Musk tweeted. "Will have no choice but to depart councils in that case."