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Paramount's acquisition of Warner Bros. Discovery has been paused until early August.

Paramount is facing a new setback in its intended acquisition of Warner Bros. Discovery: a judge has paused it until early august in the context of a legal case brought forward by several states.

Concretely, U.S. District Judge Araceli Martinez-Olguin in Oakland said the states made a "strong showing" that the acquisition would amount to an unlawful decrease in competition. Warner Bros. Discover's stock fell as much as 4% on Monday before pairing some gains.

Martinez-Olguin said the deal would likely violate antitrust law, considering it would give the company 27% of the market for the distribution of films. Combined with Disney, Universal, and Sony, four companies would account for the overwhelming majority of major studio releases, raising concerns about competition throughout the entertainment industry.

The judge also agreed with the states that letting the deal go through could present challenges if it is ultimately determined it was illegal, including job losses and the sharing of sensitive information.

A Paramount spokesperson rejected the decision, telling Reuters that the company is "confident the evidence will demonstrate that the State AGs' antitrust arguments are without merit as their alleged markets and claims of anticompetitive effects are without any basis in modern market ​realities."

The lawsuit in question is being led by California Attorney General Rob Bonta and joined by attorneys general from 11 other states. It marks the most significant legal challenge yet to one of the largest entertainment mergers in history.

If completed, the deal would combine some of the world's most recognizable entertainment brands under one corporate umbrella, including HBO, HBO Max, CNN, Warner Bros. Pictures, DC Studios, CBS, Paramount Pictures, MTV, Nickelodeon, Showtime and Paramount+.

State attorneys general argue that such concentration would give the combined company outsized influence over the production and distribution of films, television programming, and streaming content.

"The proposed merger would extinguish competition," the lawsuit argues, alleging consumers could face "higher prices, lower quality, and less content for film," while creative workers could encounter fewer employment opportunities and less bargaining power.

The lawsuit also argues that consolidation would strengthen the company's leverage over movie theatres, basic cable distributors, and, ultimately, audiences nationwide," while reducing incentives to invest in diverse programming and independent productions.

The legal challenge comes despite the U.S. Department of Justice previously allowing the transaction to move forward after concluding its federal antitrust review. Several international regulators have also approved the merger or are continuing their reviews, leaving the coalition of state attorneys general as the deal's most immediate legal obstacle.

Paramount Skydance has strongly defended the acquisition, arguing that combining with Warner Bros. Discovery is necessary to compete against technology giants such as Netflix, Amazon and YouTube, which have reshaped the global entertainment landscape.

The company has also said the merger would generate billions of dollars in efficiencies while allowing it to invest more heavily in films, television programming and streaming services.