KEY POINTS
  • "If everyone starts to build a wall and closes economies, we have seen examples of that all over the world, then ultimately the one who closes the border suffers," Daimler board member Martin Daum told CNBC.
  • In June, Trump threatened a 20 percent tariff on all car imports from the European Union.
  • The Euro Stoxx Autos index is down nearly 12 percent since the start of the year.

The escalating trade spat between the United States and China has impacted the autos sector with car-makers finding it increasingly tough to plan longer-term projects, a Daimler board member told CNBC on Wednesday.

"The steel and aluminium prices skyrocketed in the United States, making our tax more expensive there," Martin Daum said, adding that the big concern is planning future projects.