Canada and the United States have stepped up trade negotiations in an effort to reach an agreement before new U.S. tariffs are due to take effect on August 19. The talks are continuing in Washington, Bloomberg reports.

U.S. President Donald Trump’s administration has threatened to impose additional 50% tariffs on around $20 billion worth of Canadian goods. The measures apply in particular to cars, dairy products and alcoholic beverages and, according to documents released by the White House, are due to take effect on August 19.

Canada is seeking an easing of existing U.S. tariffs, including those imposed on steel and aluminium. In return, Washington is demanding that Ottawa review restrictions imposed on U.S. cars, dairy products and alcoholic beverages.

The latest U.S. proposal provides for reductions in some tariffs, but has fallen short of the Canadian side’s expectations. Negotiations are continuing.