The Transportation Security Administration is providing passenger lists to Immigrations and Customs Enforcement to identify and detain travelers subject to deportation orders.

© Graham Dickie/The New York Times

China’s new national drive to embrace artificial intelligence is also giving the authorities new ways to monitor and control its citizens.

Xi Jinping gave two cellphones to South Korea’s president, who asked how secure they were. “You can check if there’s a backdoor,” he said with a laugh.