WASHINGTON — President Trump has signed an executive order mandating a review of an Obama-era rule aimed at protecting small streams and wetlands from development and pollution, fulfilling a campaign promise while earning the ire of environmental groups.

The order, signed at the White House Tuesday, instructs the Environmental Protection Agency and Army Corps of Engineers to review a rule that redefined “waters of the United States” protected under the Clean Water Act to include smaller creeks and wetlands.

The order asks the heads of the agencies to publish a proposed rule rescinding or revising the waters rule for notice and comment – the first step in what is likely to be a yearslong administrative review process that many expect to end up at the Supreme Court.

At a White House signing ceremony, the president called the rule, which has never been implemented because of a series of lawsuits, “one of the worst examples of federal regulation” that he said “has truly run amok.”

“It’s been a disaster,” he went on, claiming that the EPA had decided it could regulate “nearly every puddle or every ditch on a farmer’s land or any place else that they decide.”