The European Union will likely have to wait a few more days for an executive order by U.S. President Donald Trump lowering tariffs on imports of European cars and car parts, a source familiar with the EU-U.

President Trump warned that if the European Union fails to deliver on its commitment to invest $600 billion in the US, then he will ramp up tariffs against the 27-nation bloc. Last month, Trump and the EU unveiled the sketches of a preliminary trade deal,

According to a White House fact sheet on the "colossal" deal, Europe will draw down its trade barriers, zeroing out tariffs on U.S. goods and enabling agricultural and industrial products into 27 countries duty free. It isn't immediately evident what the sizable investment promised by the trade bloc will go toward.