On Wednesday afternoon, a 27-year-old Ph.D. student in Toronto was able to secure an appointment for a visa interview next week. The student, a Chinese national, hopes to travel to the U.S. for a research internship that would start in late July. “I’m really relieved,” said the student, who spoke on condition of being identified only by his surname, Chen, because he was concerned about being targeted. “I’ve been refreshing the website couple of times every day.”