A formal statement from the White House was issued with a very public error - mixing up China and Taiwan.
A press release following Donald Trump’s meeting with Chinese President Xi Jinping at the G20 summit called him president "of the Republic of China".
That is the official name of Taiwan. Mr Xi is, in fact, President of the People’s Republic of China.
习近平是"中华人民共和国"（People’s Republic of China
）国家主席，不是"中华民国"（The Republic of China
Earlier, the White House had also labelled Shinzo Abe president of Japan. He is the prime minister.
The online version of the statement on China now simply refers to "President Xi of China", and the Japan statement has also been corrected.
Social media users were quick to point out the error, which many feel should be obvious to government officials.
Chris Lu, a White House Cabinet Secretary under former President Obama, tweeted: "Ouch. White House just referred to Xi Jinping as leader of Republic of China, which is Taiwan," appending the hashtag: "#AmateurHour".