General Motors has put six of its cars under review and is evaluating whether to cancel them in the coming years, according to a report from Reuters.

The news comes as sales of cars continue to plummet in the U.S. and as consumers increasingly turn to SUVs and pickups.

The company, which employs more than 4,000 in Spring Hill, is considering plans to eliminate the Chevrolet Volt hybrid, the Buick LaCrosse, Cadillac CT6, Cadillac XTS, Chevrolet Impala and Chevrolet Sonic, according to Reuters.

UAW President Dennis Williams said Thursday the union is in ongoing discussions with GM, Ford and Fiat Chrysler about falling car sales and how to keep the automaker’s U.S. plants operating at full capacity.

Earlier this year, GM eliminated a shift at its Lordstown plant where it makes the Chevrolet Cruze.

Over the first six months of this year, industry sales have dropped a little more than 6 percent for compact cars, around 18 percent for full-size cars and for subcompact cars.