Thousands of people gathered Sunday in London's Trafalgar Square for a free screening of the Oscar-nominated film "The Salesman" in an apparent sign of unity against President Trump, The Evening Standard reported.

The Iranian director of the film, Asghar Farhadi, is boycotting Sunday's Academy Awards following President Trump's order barring people from seven predominately Muslim countries, including Iran, from entering the U.S.

"The Salesman" is up for best foreign language film.

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On Sunday, the central London Square was transformed to feature the movie, with food and drink stands. Mayor Sadiq Khan spoke during the event, saying, "President Trump can't silence me."

The mayor said the "key message" of the event is, "London is open." He said the city stands behind "all those discriminated against because of their nationalities, their faith or their background."

"There are people here from Iran to Iraq, from Shoreditch and Streatham, from Lebanon and London — showing the world that London is open. Open to talent, open to creativity and open to people," Khan said.

"At a time when people want to have travel bans, we should talk about welcoming people. At a time when people want to build walls, we should build bridges.”

Farhadi recorded a message for the event, emphasizing unity.

"Despite our different religions, cultures and nationalities, we are all citizens of the world," he said.

He said he was at the event "in spirit" and thanked those who attended "from the bottom of my heart."

According to The Guardian, he said the solidarity against President Trump's travel ban is "off to a great start."

"I hope this movement will continue and spread for it has within itself the power to stand up to fascism, be victorious in the face of extremism and say no to oppressive political powers everywhere," he said.

Speculation is running rampant that Sunday's Jimmy Kimmel-hosted spectacle could turn into a political rallying cry when it airs on ABC.