The Trump administration launched five separate complaints at the World Trade Organization Monday, claiming that tariffs placed against the U.S. by China, the European Union, Canada, Mexico, and Turkey were all illegal under the WTO’s rules.

The tariffs were retaliation for U.S. tariffs levied on steel and aluminum imports, a move the White House claimed was justified to protect national security. Monday’s complaints mark the latest escalation in the White House’s ongoing battles with the U.S.’s long-time trade partners.