U.S. stock index futures fell Monday as renewed tensions between China and the U.S. raised the possibility of a costly trade war between the two largest economies in the world.

At 05:05 ET (09:05 GMT), Dow Jones Futures fell 220 points, or 0.3%, S&P 500 Futures dropped 35 points, or 0.6%, and Nasdaq 100 Futures slipped 145 points, or 0.7%.

Wall Street is starting the new week, and month, on a weak note, handing back some of the prior month’s strong gains following a war of words between the U.S. and China.

On Friday, the broad-based S&P 500 ended May with a more than 6% gain, its best monthly performance since November 2023. The tech-heavy Nasdaq Composite surged more than 9% and the blue chip Dow Jones Industrial Average gained about 4%.