A new executive order from President Donald Trump that's part of his effort to invigorate energy production launches the possibility that his Department of Justice will go to court against state laws aimed at slashing planet-warming greenhouse gas pollution from fossil fuels.

President Donald Trump is throwing the weight of the Justice Department against the last bastion of U.S. climate action: states and cities. In a sweeping executive order signed late Tuesday, Trump ordered Attorney General Pam Bondi to “stop the enforcement of State laws” on climate change that the administration says are unconstitutional,

These State laws and policies are fundamentally irreconcilable with my Administration's objective to unleash American energy,' the president wrote. 'They should not stand.'