Paramount and Warner Bros. merger opposition

The letter, which also features signatures from Mark Ruffalo and Emma Thompson, calls on regulators to block the acquisition to protect the diversity of the entertainment industry.

Paramount has responded by stating that the merger would actually provide creators with more avenues for their work, not fewer.

The FCC has indicated it will play a 'minor' role in the merger review, focusing primarily on broadcast licenses and NFL broadcasting deals.

The deal is seen as a critical turning point for the future of traditional movie studios as they struggle to compete with streaming giants.