Cars and tariff levels on agriculture have emerged as key sticking points between the European Union and the US as the two sides work toward a provisional trade agreement in the coming days, according to people familiar with the matter.

The European Union is still hoping for a rough outline of a deal, even after President Trump talked about sending the bloc a letter outlining tariffs that would be imposed Aug. 1.

The anticipated letter is expected to detail fresh duties on imports from the EU, which remains Washington’s largest trading and investment partner.