New York (CNN Business) GM responded late Sunday to a series of angry tweets from President Donald Trump demanding that the automaker reopen or sell a plant it recently closed because of shifting customer demand.

"To be clear, under the terms of the UAW-GM National Agreement, the ultimate future of the unallocated plants will be resolved between GM and the UAW,"said in a statement, referring to the United Automobile Workers union.

The automaker announced a major global restructuring in November, including the closure of four US plants and another in Canada. It said it would cut 8,000 salaried and contract jobs, representing a 15% reduction in its workforce.

Trump tweeted Sunday evening that he spoke with GM CEO Mary Barra about the affected factoryin Lordstown, Ohio. Trump said that he "asked her to sell it or do something quickly" but that Barra "blamed the UAW Union."

Trump has repeatedly attacked GM and personally criticized Barra since the closures were first announced — perhaps in the hope that the giant carmaker would give him a political win by reconsidering its plans.

Lordstown is the first of the four US plants GM is closing. It had 1,435 hourly workers last year at the time the company announced plans to close it. Production at the plant ended this month.

Just spoke to Mary Barra, CEO of General Motors about the Lordstown Ohio plant. I am not happy that it is closed when everything else in our Country is BOOMING. I asked her to sell it or do something quickly. She blamed the UAW Union — I don't care, I just want it open! — Donald J. Trump (@realDonaldTrump) March 17, 2019

GM said in its statement Sunday that its main focus was offering employees jobs in other plants "where we have growth opportunities."

"We have now placed over 1,000 employees from our unallocated plants to other GM locations, and we have opportunities available for virtually all impacted employees," it added.

On Sunday, Trump also criticized David Green, the local UAW president at GM's Lordstown plant, labeling him a Democrat.

Green didn't immediately respond to a request for comment.

Lordstown Mayor Arno Hill said he disagreed with Trump's criticism of the local union leader.

Green "is in same boat as me," Hill said. "We have no local control, as it is between GM and UAW International. They both have a stake in this now. We will still push for a new product and remain optimistic. I am not going to beat up GM because they've been here for 53 years, they've been good neighbors."

Democrat UAW Local 1112 President David Green ought to get his act together and produce. G.M. let our Country down, but other much better car companies are coming into the U.S. in droves. I want action on Lordstown fast. Stop complaining and get the job done! 3.8% Unemployment! — Donald J. Trump (@realDonaldTrump) March 17, 2019

Brian Rothenberg, a spokesman for UAW International, said that the union's focus is on its members and that it "will leave no stone unturned in working to keep the plants open."