SOFIA, Bulgaria (AP) — The European Union has called on U.S. President Donald Trump's administration to stop threatening it with tariffs on steel and aluminum, saying Thursday it is prepared to discuss new trade incentives. In March, Trump slapped tariffs of 25 percent on steel imports and 10 percent on imported aluminum, but granted the 28 EU countries a temporary exemption until June 1. He also temporarily exempted big steel producers Canada and Mexico, provided they agree to renegotiate a North American trade deal to his satisfaction.