General Motors CEO Mary Barra shut down rumors about the possibility that Tesla could buy one of their soon-to-be-idled U.S. factories.

USA Today reports that GM’s boss admitted there was talks about Tesla buying either GM’s plant in Detroit or the one in Lordstown, Ohio, both of which are going to close soon as part of the company’s restructure plan that includes several models being killed off.

“There have been conversations in the past,” Barra said during a presentation for investors and analysts. “But Tesla’s not interested in our workforce represented by the UAW, so really it’s a moot point.”

The UAW (United Auto Workers) union has a long history with Tesla, having accused the Palo Alto-based EV maker of banning its employees from organizing a union and discussing safety issues. Tesla has been denying UAW’s charges and the two are currently battling it out in a court.

Elon Musk has recently expressed interest in buying one of GM’s factories, following the news of General Motors’ restructure plan.

After all, it would not be the first time Tesla buys an unused manufacturing facility, as the Fremont factory in California was formerly a joint venture between Toyota and GM. This time, however, the proposed plans seem to come attached with UAW workers, which apparently is a sticking point.