Varietyfirst reportedon Warrens letter.

Discovery to create a sports streaming platform called Venu.

But the sports joint venture was abandoned anyway.

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WASHINGTON, DC - JANUARY 29: Senate Finance Committee member Sen. Elizabeth Warren (D-MA) questions Robert F. Kennedy Jr., U.S. President Donald Trump’s nominee for Secretary of Health and Human Services, as he testifies during his Senate Finance Committee confirmation hearing at the Dirksen Senate Office Building on January 29, 2025 in Washington, DC. In addition to meeting with the Senate Finance Committee, Kennedy will also meet with the Senate Health, Education, Labor and Pensions Committee tomorrow. (Photo by Anna Moneymaker/Getty Images)

As the companies have acknowledged, the sports streaming market is rapidly changing, Warren wrote.

A Disney spokesperson declined to comment.

Trumps choice to lead the Justice Departments Antitrust Division, Gail Slater, has yet to be confirmed.

Donald Trump and ABC News' Terry Moran

A spokesperson for the Justice Departments Antitrust Division said that they received the letter but declined comment.