The Interior Department recommendations, which included changes to a handful of other national monuments, stemmed from an executive order Mr. Trump signed in April requiring a review of 24 sites across the country.

Earlier on Friday, Mr. Zinke met with Mr. Trump to discuss the recommendations. Sarah Huckabee Sanders, the White House spokeswoman, said a final report would be released “shortly.” She did not confirm whether the president has signed off on it in part or in whole.

“I’m not going to get ahead of the president’s announcement on the specifics of that, but I can tell you he will be going to Utah in the first part of early December and we will release more details at that point, if not before,” Ms. Sanders said.

A spokeswoman from the Interior Department did not respond to requests for comment.

Environmental groups denounced the decision.