Unfortunately, with the exception of AOC and few others, they aren't stupid enough to make it that easy to see the connections between China and themselves. However, I believe they have to keep records of all meetings with lobbyists and foreigners, and a more detailed investigation of their finances, combined with info on who they have met with, would likely reveal the corruption from China and big Pharma, among others.
Unfortunately, with the exception of AOC and few others, they aren't stupid enough to make it that easy to see the connections between China and themselves. However, I believe they have to keep records of all meetings with lobbyists and foreigners, and a more detailed investigation of their finances, combined with info on who they have met with, would likely reveal the corruption from China and big Pharma, among others.