General Motors is expected to start a new round of layoffs on Monday, cutting over 4,000 white-collar jobs, according to a report.

The layoffs are part of a larger restructuring plan that was first announced in November, the Detroit Free Press reported.

At the time, GM said it wanted to cut about 8,000 salaried workers from its payroll. Since then, the company has cut about 1,500 contract jobs and more than 2,250 workers have taken a voluntary buyout, the report said.

The exact timing of these layoffs remains unclear, however.

“We’ve indicated that the involuntary reductions would happen in the first quarter,” GM spokesman Pat Morrissey told the newspaper.

“We are not confirming timing,” he added. “Our employees are our priority and we will communicate with them first.”

GM also said in November that it planned to close five car plants, four in the US and one in Canada. Unhappy with the announcement, President Donald Trump said at the time new car tariffs were being “studied.”

With the restructuring, GM is expected to save about $6 billion by 2020, according to the Detroit News.

Workers told the Free Press they were anxious about the job cuts.

“Everyone’s waiting for the ax to fall,” an employee told the Free Press. “You don’t know if you should plan ahead for anything or not?”

Reports of the layoffs came just days after Consumers Energy, a public utility provider in Michigan, asked GM to suspend operations at some plants because of electricity supply issues due to the polar vortex.

GM said Thursday that new vehicle sales in the US fell 2.7 percent in the fourth quarter. The automaker is expected to release its fourth-quarter earnings report on Wednesday.