Why aren't more American students going to China to study?

US Secretary of State Antony Blinken was recently in China, where he met with American college students in Shanghai and told them, I think what you're engaged in is so important to the future of both of our countries." But the numbers of US students studying in China is way down compared to previous years. The pandemic is one reason why. But there are other pressures, some of them related to the tense diplomatic relationship between the US and China. The World's Matthew Bell reports