Currently the UAW has an agreement with Ford and GM that workers are paid a base wage of $19.28 all the way up to $28 for the most experienced workers on the assembly line. The car manufacturers are asking that the UAW establish as lower wage tier for new workers in the U.S. The U.S. automakers are currently struggling to compete with European and Asian manufacturers.
See "GM, Ford to Ask UAW for New Lower-Pay Tier in U.S.: Bloomberg", The New York Times, March 23, 2015