Donald Trump has threatened to impose an additional 50% tariff on imports from China on Wednesday unless the country rescinds its retaliatory tariffs on the United States by Tuesday.

The news comes on the third day of catastrophic market falls around the globe since Trump announced his trade war last Wednesday with tariffs on the US’s trading partners.

As part of that move the White House announced it would impose a 34% tariff on Chinese imports. In response, Beijing announced a 34% tariff on US imports.