Helen Mirren, the British actress famous for roles in “The Queen” and “Gosford Park,” is joining the war on Netflix Inc.

While on stage to promote her new film “The Good Liar” at the CinemaCon conference in Las Vegas, Mirren said, “I love Netflix, but f—- Netflix. There’s nothing like sitting in a cinema.”

The remarks underscore tensions between Hollywood traditionalists and streaming platforms like Netflix. After the company’s “Roma” almost won an Academy Award for best picture, it’s come under fire for undermining the movie industry’s longstanding practices.

Steven Spielberg, who won a best-picture award for “Schindler’s List,” has reportedly pushed for changes at the Academy of Motion Picture Arts & Sciences. He has said that streaming movies shouldn’t be considered for Oscars unless they have a traditional run in theaters. As one of the three Academy governors of the directors branch, Spielberg helps set policy for the organization.

The U.S. Justice Department also has weighed in on the issue. It warned the Academy that if potential rule changes hurt Netflix, they may violate laws meant to protect competition, according to a person familiar with the matter. Makan Delrahim, head of the agency’s antitrust division, sent a letter to Academy Chief Executive Officer Dawn Hudson on March 21, expressing concern about the way new award rules might be written, the person said.

Mirren, 73, was speaking to a friendly audience: CinemaCon is a convention for theater owners. Last year, some major movie chains refused to exhibit Netflix’s films — and wouldn’t even show “Roma” after it received the most Oscar nominations of any picture.

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Netflix’s pursuit of oscars threatens to become antitrust issue

The U.S. Justice Department warned the Academy of Motion Picture Arts and Sciences that potential rule changes, which could hurt Netflix and other streaming platforms, may violate laws meant to protection competition, according to a person familiar with the matter.

Makan Delrahim, head of the agency’s antitrust division, sent the letter to Academy Chief Executive Officer Dawn Hudson on March 21, expressing concern about the way new award rules might be written, the person said.

Delrahim is wading into a contentious debate in the entertainment industry. After Netflix’s “Roma” nearly won a best-picture Oscar this year, Hollywood traditionalists like Steven Spielberg have said that streaming movies shouldn’t be considered for awards. “Roma” did play in theaters, but in a limited run.

Spielberg has pushed for the Academy to adopt rules requiring movies to screen in theaters for a few weeks before they appear anywhere else. Spielberg “feels strongly about the difference between the streaming and theatrical situation,” a spokesperson for the filmmaker told Indiewire.

Such a rule would invalidate most of the movies released by Netflix, as well as some of those released by Amazon. Netflix has softened its stance on the matter over the past year, releasing “Roma” in theaters exclusively for a couple weeks, but the company doesn’t plan to give movies much more time than that, the company’s Ted Sarandos told Bloomberg.

“We’ve received a letter from the Dept. of Justice and have responded accordingly,” an Academy spokesperson said in an email. “The Academy’s Board of Governors will meet on April 23 for its annual awards rules meeting, where all branches submit possible updates for consideration.”

Spielberg, who won a best-picture award for “Schindler’s List,” is one of the three Academy governors of the directors branch. The board of governors is tasked with setting the Academy’s strategic vision.

In the letter, Delrahim said that if films that are distributed through online streaming services are excluded from Oscar eligibility and those films lose revenue as a result of being shut out of the awards, the rule could violate antitrust laws, according to the person.

The Justice Department declined to comment. Variety reported earlier on the Justice Department’s letter.