France has warned it will retaliate with the full support of the European Union if the US imposes tariffs on up to $2.4 billion worth of French products in response to the country's digital tax plans. 

The US is considering 100 per cent tariffs on some goods in response to France's decision to tax the local digital business of major tech companies such as Google and Facebook. 

With a decision on the tariffs expected in coming days, French Finance Minister Bruno Le Maire met today with EU trade chief Phil Hogan in Paris.

'We believe that the American project of sanctions against the French digital tax is unfriendly, inappropriate and illegitimate,' Le Maire said.

If US tariffs were to be imposed, 'we would bring the case to the World Trade Organization and we would be ready to react,' Le Maire said.

Hogan said the question of the digital tax is a 'very major bone of contention with the United States.'