Though Zhang was impressed by the academic rigour in America and enjoyed working with colleagues at Brown University, he says he won't consider ever visiting the country again due to the screening experience.
"It was very scary. I felt my safety could be harmed at any time," he says.
Worrying for a gloomy prospect of US-China relations, Zhang has started to lobby his Chinese friends in America to consider returning home.
Though Zhang was impressed by the academic rigour in America and enjoyed working with colleagues at Brown University, he says he won't consider ever visiting the country again due to the screening experience.
"It was very scary. I felt my safety could be harmed at any time," he says.
Worrying for a gloomy prospect of US-China relations, Zhang has started to lobby his Chinese friends in America to consider returning home.