Germany’s Foreign Minister Frank-Walter Steinmeier said that U.S. President-Elect Donald Trump’s comments that NATO was obsolete had aroused concern across the 28-member alliance.

Speaking after a meeting with alliance Secretary-General Jens Stoltenberg in Brussels, Steinmeier said Trump’s remarks contradicted views expressed by designated Defense Secretary James Mattis.

Trump, who is due to be sworn in as President on Friday, said NATO was obsolete because it had not defended against terrorist attacks.