Two Senate Democrats want President Trump to explain why he plans to shrink some national monuments without getting the U.S. Forest Service’s recommendation to do so first.

In a letter to Trump on Friday, Sens. Debbie Stabenow Deborah (Debbie) Ann StabenowOVERNIGHT ENERGY: Trump rollbacks could add 1.8 billion tons of greenhouse gas emissions over 15 years: analysis | Intensifying natural disasters do little to move needle on climate efforts | Experts warn wildfire smoke could worsen COVID-19 GAO report finds brokers offered false info on coverage for pre-existing conditions Democrats back away from quick reversal of Trump tax cuts MORE (D-Mich.) and Michael Bennet Michael Farrand BennetOVERNIGHT ENERGY: House Democrats tee up vote on climate-focused energy bill next week | EPA reappoints controversial leader to air quality advisory committee | Coronavirus creates delay in Pentagon research for alternative to 'forever chemicals' Senate Democrats demand White House fire controversial head of public lands agency Next crisis, keep people working and give them raises MORE (D-Colo.) questioned why he would move forward with shrinking some monuments containing Forest Service land despite the department’s lack of a recommendation for doing so.

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Trump is expected to announce his plan to shrink at least two national monuments in Utah on Monday. One of the monuments, the 1.3-million acre Bears Ears, contains some Forest Service land.

“In advance of any decision to attempt to modify the boundaries of national monuments, we write to seek specific details regarding your plans for treatment of certain acres within five national monuments that are managed by the U.S. Department of Agriculture’s (USDA) Forest Service,” the Democrats wrote.

President Trump tasked the Interior Department with assessing potential changes to large national monument designations. Both Secretary Ryan Zinke Ryan Keith ZinkeTrump extends Florida offshore drilling pause, expands it to Georgia, South Carolina Conspicuous by their absence from the Republican Convention Trump flails as audience dwindles and ratings plummet MORE and Trump have said they support cutting the acreage of the Bears Ears monument, which then-President Obama designated during his last month in office.

Four California monuments that are subject to Interior’s review also have Forest Service acreage within their borders.

But Stabenow and Bennet said the Forest Service, which is part of the USDA, did not specifically recommend Trump trim any of the monuments. An agency official told lawmakers earlier this year that, “no specific acres were recommended for removal.”

Conservationists deeply oppose Trump’s monuments review and have vowed to sue over any attempt to shrink monuments. Conservatives, though, say the review could fix what they consider overreach in the government’s management of federal lands.