WASHINGTON (Reuters) – The U.S. Energy Department said on Tuesday it will not comply with a request from President-elect Donald Trump’s Energy Department transition team for the names of people who have worked on climate change and the professional society memberships of lab workers.

The Energy Department’s response could signal a rocky transition for the president-elect’s energy team and potential friction between the new leadership and the staffers who remain in place.

The memo sent to the Energy Department on Tuesday and reviewed by Reuters last week contains 74 questions, including a request for a list of all department employees and contractors who attended the annual global climate talks hosted by the United Nations within the last five years.

Energy Department spokesman Eben Burnham-Snyder said Tuesday the department will not comply.

“Our career workforce, including our contractors and employees at our labs, comprise the backbone of (the Energy Department) and the important work our department does to benefit the American people,” Burnham-Snyder said.

“We are going to respect the professional and scientific integrity and independence of our employees at our labs and across our department,” he added. “We will be forthcoming with all publicly available information with the transition team. We will not be providing any individual names to the transition team.”

He added that the request “left many in our workforce unsettled.”

Andrew Rosenberg, an official at the Union of Concerned Scientists, said the Energy Department “made the right choice in refusing this absurd and dangerous request. Federal agencies need the best available science to respond to the growing risk of climate change.”

Reuters reported late Monday that former Texas Governor Rick Perry is expected to be named by Trump to run the Energy Department. The agency employs more than 90,000 people working on nuclear weapons maintenance and research labs, nuclear energy, advanced renewable energy, batteries and climate science.

The memo sought a list of all department employees or contractors who have attended any meetings on the social cost of carbon, a measurement that federal agencies use to weigh the costs and benefits of new energy and environmental regulations. It also asked for all publications written by employees at the department’s 17 national laboratories for the past three years.

Trump transition officials declined to comment on the memo.

“This feels like the first draft of an eventual political enemies list,” a Department of Energy employee, who asked not to be identified because he feared a reprisal by the Trump transition team, had told Reuters.

Josh Earnest, a White House spokesman, said in a news briefing on Tuesday that the queries “could have been an attempt to target civil servants,” including “scientists and lawyers and other experts who are critical to the success of the federal government’s ability to make policy.”

By design, their work transcends the term of any one president, Earnest said.

Trump, a Republican, said during his election campaign that climate change was a hoax perpetrated by China to damage U.S. manufacturing. He said he would rip up last year’s landmark global climate deal struck in Paris that was signed by President Barack Obama.

Since winning the Nov. 8 election, however, Trump has said he will keep an “open mind” about the Paris deal. He also met with former Vice President Al Gore, a strong advocate for action on climate change.

After that meeting, he picked Oklahoma Attorney General Scott Pruitt, a climate change skeptic, to head the Environmental Protection Agency.

(Additional reporting by Timothy Gardner; Editing by Jeffrey Benkoe and Jonathan Oatis)

IMAGE: A child embraces a globe shaped balloon ahead of the start of the 2015 Paris World Climate Change Conference, known as the COP21 summit, in Rome, Italy , November 29, 2015. REUTERS/Alessandro Bianchi