MEXICO CITY (AP) — Mexico’s president on Wednesday designated Roberto Velasco, the foreign ministry’s subsecretary for North America and a leading expert in bilateral relations with the U.S., as the country’s new foreign minister during a critical time for Mexico-U.S. relations. The previous minister, Juan Ramón de la Fuente, a 74-year-old psychiatrist who has been a key member of Mexican President Claudia Sheinbaum’s administration, requested to step down for health reasons, the president’s