A Very Stable Genius: Donald J. Trump's Testing of America by Philip Rucker and Carol Leonnig:
As with most of his foreign leader meetings, Trump had been briefed but didn’t appear to have retained the material and instead tried to wing it. He took a hard right turn into a nitpicky complaint about trade imbalances. Modi tried to refocus on the threats India faced from Aghanistan, China, and Pakistan. His mention of Afghanistan led Trump off into a lengthy tangent about how stupid it had been for the United States to maintain its military presence in Afghanistan for so many years. When Modi mentioned his concern about China’s amibitions and aggression in the region, Trump revealed a stunning ignorance about geography.
“It’s not like you’ve got China on your border,” Trump said, seeming to dismiss the threat to India.
Modi’s eyes bulged out in surprise. Aides noticed him giving a sidelong glance at Tillerson, who accompanied Trump as part of the U.S. delegation. The Indian prime minister considered Tillerson among the best-versed Americans on the region’s security challenges, and together they had been plotting a new partnership. Tillerson’s eyes flashed open wide at Trump’s comment, but he quickly put his hand to his brow, appearing to the Indian delegation to attempt not to offend the president as well as to signal to Modi that he knew this statement was nuts.