Chicago's Mayor Brandon Johnson attends a press briefing in Rome, Thursday, May 28, 2026. (AP Photo/Alessandra Tarantino)

Chicago's Mayor Brandon Johnson, right, attends a tour at the Metro C Colosseum train station in Rome, Friday, May 29, 2026. (AP Photo/Alessandra Tarantino)

Chicago's Mayor Brandon Johnson, second from left, attends a tour at the Metro C Colosseum train station in Rome, Friday, May 29, 2026. (AP Photo/Alessandra Tarantino)

Chicago's Mayor Brandon Johnson attends an interview in a cafe in Rome Friday, May 29, 2026. (AP Photo/Alessandra Tarantino)

Chicago's Mayor Brandon Johnson, center, arrives for a tour at the Metro C Colosseum train station in Rome, Friday, May 29, 2026. (AP Photo/Alessandra Tarantino)

FILE - Chinese astronaut for the Shenzhou 21 mission, from left, Zhang Hongzhang, Wu Fei and Zhang Lu wave as they attend a see-off ceremony for their manned space mission at the Jiuquan Satellite Launch Center in northwestern China, Friday, Oct. 31, 2025. (AP Photo/Andy Wong, File)

In this photo released by Xinhua News Agency, astronaut Wu Fei waves as he is carried out of the re-entry capsule after it landed successfully at the Dongfeng landing site in northern China's Inner Mongolia Autonomous Region on Friday, May 29, 2026. (Li Zhipeng/Xinhua via AP)

In this photo released by Xinhua News Agency, astronaut Zhang Hongzhang waves as he is carried out of the re-entry capsule after it landed successfully at the Dongfeng landing site in northern China's Inner Mongolia Autonomous Region on Friday, May 29, 2026. (Lian Zhen/Xinhua via AP)