Donald Trump has repeatedly urged Xi Jinping to call him for discussions about a potential trade deal. But any off-ramp to the economic tensions will likely run through Vice Premier He Lifeng, who is Xi's Sino-American trade tsar.

The Treasury secretary said that the President Trump and Xi Jinping of China have a good relationship but that he was not aware of a call, which Mr. Trump had alluded to last week.

Standing outside his friend’s cupcake shop, he says Donald Trump’s levies are a sign that America feels threatened by China’s rise. America’s power is declining, he says. “What you feel in today’s world is that hegemony is very hard to achieve.