U.S. and Chinese officials on Tuesday endorsed the status quo for the phase-one trade agreement the two sides signed in January, refuting talk of renegotiation or termination. Last week, Trump suggested he might walk away from the phase-one agreement and impose new tariffs on China as a means of holding Beijing accountable for its purported role in the COVID-19 outbreak. This week China’s state-run media, citing sources close to the Chinese government, suggested Beijing might consider invalidating the phase-one deal...