Aircraft, machinery, cars, chemicals and medical devices are the leading big-ticket items on the latest list of U.S. goods the European Commission has proposed to impose tariffs on if talks with Washington do not yield an agreement on trade.

Italy's foreign minister warned that, while he hopes for successful negotiations, the EU will respond resolutely to Trump's latest tariff threat.

Stocks closed slightly higher on Monday, shrugging off President Donald Trump's announced tariffs over the weekend targeting the European Union and Mexico. Those new levies rekindled tensions with two of the largest U.S. trade partners and threatened to raise consumer prices.