In midday trading in Europe, France's CAC 40 fell 0.4% to 5,307, while London's FTSE also slid 0.4% to 7,222. Germany's DAX was down 0.2% to 11,672. On Wall Street, futures for the S&P 500 and Dow Jones Industrial Average were off 0.6%, pointing to another day of selling.

On Friday, the benchmark Standard & Poor's 500 index dropped as much as 1.3% after Trump said it would be "fine" if trade talks next month don't happen." Safe havens are "still in demand on trade war anxiety," said Alfonso Esparza of Oanda in a report. "Headwinds remain strong as a deal in the short term between the U.S. and China is a long shot."

In Asia, the Shanghai Composite Index declined 0.2% to 2,814.99 and Hong Kong's Hang Seng shed 0.4% to 25,824.72. Seoul's Kospi gained 0.2% to 1,942.99 and Sydney's S&P-ASX 200 was 6 points higher at 6,590.30. Tokyo was closed for a holiday.

Taiwan declined while New Zealand was unchanged. Markets in India, Singapore and Thailand were also closed for holidays. ENERGY: Benchmark U.S. crude lost 65 cents per barrel to $53.85 in electronic trading on the New York Mercantile Exchange. The contract rose $1.94 on Friday to close at $54.40. Brent crude, used to price international oils, shed 39 cents to $58.14 per barrel in London. It gained $1.15 the previous session to $58.53.

CURRENCY: The dollar edged down to 105.08 yen from Friday's 105.66 yen. The euro ticked down slightly to $1.1193 from $1.1201.

Matt Ott in Washington contributed to this report.