France is ready to go to the World Trade Organization to challenge US President Donald Trump’s threat to put tariffs on French goods in a row over a French tax on internet companies, its finance minister said on Sunday.“We are ready to take this to an international court, notably the WTO, because the national tax on digital companies touches US companies in the same way as EU or French companies or Chinese. It is not discriminatory,” Finance Minister Bruno Le Maire told France 3 television. Paris has long complained about US digital companies not paying enough tax on revenues earned in France. In July, the French government decided to apply a 3 percent levy on revenue from digital services earned in France by firms with more than €25 million in French revenue and €750 million ($845 million) worldwide. It is due to kick in retroactively from the start of 2019.Washington is threatening to retaliate with heavy duties on imports of French cheeses and luxury handbags, but France and the EU say they are ready to retaliate in turn if Trump carries out the threat. Le Maire said France was willing to discuss a global digital tax with the US at the Organization for Economic Cooperation and Development (OECD), but that such a tax could not be optional for internet companies.