Sen. Cory Booker (D-NJ), the top Democrat on the Senate antitrust subcommittee, will hold a “spotlight hearing” on Wednesday on Paramount‘s proposed merger with Warner Bros. Discovery.

Booker also has invited Paramount CEO David Ellison to testify, follow up on previous letters asking him to appear.

A “spotlight hearing” is not an official hearing on the Senate Judiciary schedule, but rather are typically held by one or more members of a party to focus on a particular issue. Last month, Sen. Adam Schiff (D-CA) and Rep. Laura Friedman (D-CA) held a spotlight hearing in Los Angeles on the Paramount-Warner Bros. Discovery merger.

Per Booker’s office, those scheduled to appear at Wednesday’s hearing include David Borenstein, this year’s documentary feature winner for Mr. Nobody Against Putin; Michael Isaac, director of legal services at the Writers Guild of America East; attorney Katie Phang; and Mara Verheyden-Hilliard, co-founder and executive director of the Partnership for Civil Justice Fund and member of the steering committee of Jane Fonda’s Committee for the First Amendment.

Fonda’s committee helped organize an open letter of industry professionals opposing the Paramount-WBD merger. A spokesperson for another group that is involved in the effort, the Democracy Defenders Fund, said that more than 2,000 have signed on to the letter, with Edward Norton, Pedro Pascal, Florence Pugh and Atsuko Okatsuka recently adding their names.

A Paramount spokesperson did not immediately respond to a request for comment.

In his latest message to Ellison, Booker noted Paramount’s response to the open letter. “Paramount stated that the merger would ensure that creatives have ‘more avenues for their work, not fewer’ and that the combined company would ‘greenlight more projects’ and ‘back bold ideas.’ These are serious commitments. This forum is an opportunity for you to make them directly to Congress and to the workers, journalists and creators whose livelihoods depend on whether these promises are kept.” The New York Times first reported on Booker’s letter.