Donald Trump is vulnerable on China. So is Joe Biden.

The growing Trump-Biden war over China, explained.

China is poised to be the key foreign policy issue during the 2020 election, and the fight over which party — and which candidate — can best handle the country is in full swing.

To President Donald Trump, it’s a matter of who’s “tougher.” On that metric, he, of course, believes he has the upper hand. He launched a trade war against China, has sharply criticized Beijing for reacting slowly to the coronavirus, and can say he prioritized US-China relations far more than...