A California law firm representing some Hyundai and Kia owners in lawsuits against the carmakers over thefts is urging Congress to take action on the issue.

It’s the latest development in a series of pushbacks against the South Korean brands to more aggressively address the thefts of models without immobilizing antitheft technology as standard.

Multiple major U.S. cities have sued the automakers, about two dozen attorneys general have urged them to take stronger action about the thefts, and 18 states have asked a federal regulator to recall the 2011- to 2022 models in question.

Now MLG Attorneys at Law has written a letter to Washington Sen. Maria Cantwell to take up the matter as chairwoman of the Committee on Commerce, Science and Transportation. The firm said in a statement that the committee has previously brought automakers to testify before Congress, resulting in action on vehicle safety issues.

MLG said it’s leading a class-action lawsuit against Hyundai and Kia over the thefts. It said it’s now representing a growing list of personal-injury cases related to the thefts.

The carmakers have expedited measures intended to prevent thefts and help vehicle owners get their models insured, including speeding up a software update and working with insurer AAA to insure affected models. But the increasingly loud pushback from various corners maintains they’re not doing enough.

LEARN MORE: States Seek Recall of Theft-Prone Hyundai, Kia Models