President Donald Trump’s trade war will wreak greater economic damage than previously expected, both in the United States and everywhere else, according to new forecasts by the Organisation for Economic Co-operation and Development.

The Trump administration on Monday asked a U.S. appeals court to pause a second court ruling that found the president had exceeded his authority by imposing sweeping tariffs on imports, saying the decision jeopardizes trade negotiations with other nations.

Donald Trump’s combative trade policies have tipped the world economy into a downturn, with the US among the hardest hit, the OECD said.