Federal authorities say the proposed design for a California driver's license for immigrants in the country illegally doesn't meet national security standards.
In a copy of a letter obtained by The Associated Press, Homeland Security officials told California's Department of Motor Vehicles that the license would need to state on its face that it cannot be used for federal purposes and should contain a unique design or color.
Otherwise, federal officials said, the license would not meet requirements under the Real ID Act.
California has been planning to issue licenses to immigrants with different lettering on the front and a notice that the card isn't valid federal identification on the back.
A DMV spokesman says the agency will work with lawmakers, communities and federal officials on the new license.