Secretary of State Rex Tillerson is meeting with Chinese officials today. Tillerson was planning to use the meetings to press Chinese officials to continue to confront North Korea over its nuclear program. But on Tuesday afternoon, President Trump appeared to abandon this effort in a tweet, writing, “While I greatly appreciate the efforts of President Xi & China to help with North Korea, it has not worked out. At least I know China tried!” The New York Times reports that senior officials say they’re trying to understand the meaning of the tweet.