The European Union estimates that the first wave of Donald Trump’s steel and aluminum tariffs will hit as much as €28 billion ($29.3 billion) of the bloc’s exports in what would be a massive escalation in the US president’s trade war.

The president, who has threatened and delayed other tariffs, said he will announce the measures Monday. Canada and Mexico are among the top U.S. steel suppliers.

The Coalition of American Metal Manufacturers and Users (CAMMU) has warned that "Re-Imposing 25 percent tariffs on steel and aluminum imports from our allies and without a workable exclusion process puts U.