More than two dozen privacy and advocacy organizations are calling on California Gov. Gavin Newsom to remove a network of covert license plate readers deployed across Southern California that the groups believe feed data into a controversial US Border Patrol predictive domestic intelligence program that scans the country’s roadways for suspicious travel patterns.

“We ask that your administration investigate and release the relevant permits, revoke them, and initiate the removal of these devices,” read the letter sent Tuesday by the Electronic Frontier Foundation, Imperial Valley Equity and Justice and other nonprofits.

An Associated Press investigation published in November revealed that the US Border Patrol, an agency under US Customs and Border Protection, had hidden license plate readers in ordinary traffic safety equipment. The data collected by the Border Patrol plate readers was then fed into a predictive intelligence program monitoring millions of American drivers nationwide to identify and detain people whose travel patterns it deems suspicious.

AP obtained land use permits from Arizona showing that the Border Patrol went to great lengths to conceal its surveillance equipment in that state, camouflaging it by placing it inside orange and yellow construction barrels dotting highways.