Trade talks between the U.S. and China in London are going well and could spill into a third day, U.S. negotiators said, as the two superpowers pushed for a breakthrough on duelling export controls that had threatened to unravel a delicate tariff truce.

The U.S. and China held a second day of talks Tuesday in London aimed at easing their trade dispute, after President Donald Trump said China is “not easy” but the U.S. was “doing well” at the negotiations.