President Trump’s new hardline stance on tariffs could create friction with U.S. allies, according to CNBC. Trump’s threat to impose tariffs on European cars, in particular, has raised concerns in Europe. The U.S. and European Union have been negotiating a trade deal, but the tariff threat could derail those talks. Trump’s stance could also impact relations with Japan and South Korea, who have been important U.S. trading partners. The tariffs could lead to retaliation from these countries, potentially damaging U.S. exports.