President Trump’s threats are carrying more weight after his moves against Canada, Mexico and China. Europe has been preparing for the possibility of a trade war for months.

President Donald Trump's move to impose or threaten massive tariffs against China, Mexico, Canada and the European Union affect about $2 trillion worth of U.S. imports and have the potential to disrupt business for major Cincinnati companies that rely on foreign goods or that sell goods overseas.

"Tariffs are a negative in respect of economic development," Ireland's Taoiseach said as President Trump vows to place tariffs on the EU.