Are there actual risks associated with allowing Chinese students access to U.S. research centers, or is it mostly just political talk?

Should Texas issue disaster declarations or formally declare an invasion over the "cartel operations, weaponized mass migration, and the release of violent offenders", as Ammon Blair argues?
Should political parties have internal discipline mechanisms to ensure that their MPs support party policy?
What kind of relationships do U.S. and Chinese elites build through student exchanges, and how do these connections influence politics or business?