BEIJING — President Trump’s trade war with China has prompted a broad rethinking of how the two economies have become so intertwined, leading some manufacturers to trim supply chains in China and American authorities to start cutting off crucial technology for Chinese companies.

Now another important area is getting a close look: financial markets.

Some trade experts and others urging the Trump administration to keep a hawkish stance are discussing whether the White House should curb China’s access to Wall Street. Chinese companies have raised tens of billions of dollars through American financial markets in recent years.

Stephen K. Bannon, Mr. Trump’s former chief strategist, said there were continuing efforts inside and outside the administration to rethink China’s role in American stock markets, in part because of a lack of transparency about the ultimate owners of Chinese companies.

“The New York Stock Exchange and Nasdaq are breaching their fiduciary responsibility to institutional investors, the pension funds of hardworking Americans,” Mr. Bannon said. “It’s outrageous. All of it should be shut down immediately.”