Labour has been urged to launch a probe into the chairman of the Southbank Centre amid claims of antisemitism.
Culture Secretary Lisa Nandy has been told to by Shadow Culture Secretary Nigel Huddleston to investigate a series of allegedly antisemitic posts by Misan Harriman, the centre's chairman.
Mr Huddleston has also requested the Arts Council review its funding of London's largest arts venue.
But Mr Harriman, an Oscar nominee, has received support from more than 21,000 people, including Gary Lineker, Louis Theroux, Susan Sarandon and Mark Ruffalo.
Mr Harriman has been accused of comparing voters of Reform UK to Nazi supporters - which have resulted in him being called a "crass moron" by Reform's Treasury spokesman Robert Jenrick.
He had also shared a post which appeared to suggest there was a conspiracy to make the Golders Green attacks entirely about Jewish victims and not about a Muslim man who was allegedly stabbed by the same man, earlier that day.
Mr Harriman has denied that he was comparing Reform voters to Nazis, adding that supporters of Nigel Farage's party were "not devils" but had been had "reading certain newspapers, reading certain news clips" and "listening to certain charlatans".
The photographer is also accused of violating Charity Commission rules by posting a photo with Green Party leader Zack Polanski and Green MP Hannah Spencer on the day of the local elections, as the governing body confirmed it was now "assessing concerns".
Misan Harriman has been accused of posting antisemitic content on social media
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In the letter, seen by The Times, Mr Huddleston has said Mr Harriman's conduct was "totally inappropriate" and brought the 75-year-old Southbank Centre into disrepute.
He said: "It is incumbent on you to investigate Mr Harriman’s continuing role at the Southbank Centre in light of his social media activity. With that in mind, will you personally look into this matter and his suitability for the role?
"Furthermore … I am sure you will encourage the Arts Council to also review this issue.
"As the minister legally responsible for Arts Council England, will you now ask the Arts Council to review its funding arrangement with the Southbank Centre?"
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Mr Harriman's conduct has been described as 'totally inappropriate' by Nigel Huddlestone
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The Southbank Centre received £18million in public funds last year.
An Arts Council England spokesperson said: "We look carefully at all concerns that are raised with us. We are not a regulatory body, and we can’t make, interpret or enforce the law, but we can ensure that the organisations we fund have the relevant policies and processes in place, and that they follow them."
Libyy Savill, the deputy chair of the arts organisation, said Mr Harriman was not antisemitic and said the Nigerian-born photographer opposed all forms of racism.
She said: "Over all this time we have observed him to be determined in his opposition to racism in all its forms, including antisemitism.
"All of us, including our chair, hold to the vision established 75 years ago at the Festival of Britain: that the Southbank Centre should be the most welcoming and inclusive of all UK arts spaces, reflecting the creativity of all the diverse cultural communities of the UK and the wider world, including the Jewish community."
A petition has received signatures from the likes of David Oyelowo (left), who starred in Misan Harriman's Oscar-nominated short film
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He has been supported by Jolyon Maugham's Good Law Project, who have launched a petition which has received more than 21,000 signatures.
The petition has received signatures from arts honorees such as Dame Tracey Emin, Sir Jonathan Pryce, along with actor David Oyelowo - who starred in Mr Harriman's Netflix short film.
A spokesman for the Southbank Centre said on Monday: "The Southbank Centre condemns all forms of antisemitism, hatred and discrimination.
"All Southbank Centre board members, including the chair, have the right to exercise their freedom of expression within the law.
"The personal views of individual members of our board do not represent the views of the Southbank Centre and in no way affect our programming nor the welcome that we extend to all."