Mr. Trump, in the midst of a five-country tour of Asia, grew concerned the untouched greens would offend the Chinese, according to people familiar with the matter. So he ordered Mr. Tillerson to start. “Rex,” he said, “eat the salad.”
Since Tillerson, the former chief of ExxonMobile, probably hadn't been ordered to eat a salad since he was playing little league, he opted to act like a grown man and declined the president's command.
It's plausible then Secretary Tillerson had grown used to being served vegetables that Trump refused. After all, the president opted for American-style cheeseburgers while in Japan during the same tour, and has a reputation for enjoying steak with ketchup.
Tillerson has passed his duties on to former CIA Director Mike Pompeo, who in addition to addressing the myriad diplomatic issues facing the United States will likely have to eat whatever salads Trump tells him to. Godspeed.