WASHINGTON – President Donald Trump spoke with Chinese President Xi Jinping on Saturday amid an ongoing trade dispute that has roiled markets.

"Just had a long and very good call with President Xi of China," Trump posted on Twitter. "Deal is moving along very well. If made, it will be very comprehensive, covering all subjects, areas and points of dispute. Big progress being made!"

Trump and Xi walked away from the Group of 20 summit in Argentina earlier this month touting the outlines of an agreement to suspend U.S. tariffs that had been scheduled to begin in January. Trump had already levied tariffs on $250 billion in Chinese goods.

But investors grew skittish about the deal days later, setting off uncertainty in the markets. The Dow Jones industrial average closed down slightly on Friday after a week punctuated by huge price swings and its worst Christmas Eve trading day ever.