A potential trade deal between the world’s top two economies hinges on Donald Trump and Xi Jinping overcoming core differences in their negotiation styles, former acting White House Chief of Staff Mick Mulvaney said.

President Donald Trump and Chinese President Xi Jinping are expected to speak very soon, a senior White House official told CNBC. The discussion would follow a series of recent flare-ups between Washington and Beijing that threaten to derail a tentative trade agreement between the two economic superpowers.

President Donald Trump and Chinese leader Xi Jinping will likely speak this week, White House Press Secretary Karoline Leavitt said on Monday, days after Trump accused China of violating an agreement to roll back tariffs and trade restrictions.