Arnault’s addition of leading weekly to stable of publications raises concerns about media ownership in France

He is known as the “wolf in cashmere” – the owner of the world’s biggest luxury group whose brands including Louis Vuitton, Dior and Tiffany have made him one of the world’s richest people.

But Bernard Arnault, a close friend of Donald Trump, is under fire from journalists’ unions in France for buying up almost all the country’s business and economic press.