Over 1,000 creatives in Hollywood have signed an open letter backing any legal action that California Attorney General Rob Bonta may take to block the merger between Paramount Skydance and Warner Bros. Discovery.

The signatories expressed their “unequivocal opposition” to the transaction on Monday, warning that it would result in fewer production jobs, higher costs, and less consumer choice. They also voiced concern that the merger would reduce the number of major U.S. film studios to four.