You're framing this in an odd way if you want neutral responses. Is withdrawing federal funding an attack? The government has always used the power of the purse as a lever to influence many institutions, including universities, and it often uses this mechanism to exert influence for ideological purposes. The most famous example is withholding funding for roads until states mandated a drinking age of 21. It's how the federal-state power asymmetry works. The disturbing thing is that Congress isn't really the one exerting it in this case, not that it's being used at all.

As for the roads example, which would go to my second point if I understand you correctly, I think the analogy is limited: roads aren't gate-kept by admissions committees for certain intangible criteria for who can ride on them, with an artificial limit on how many cars overall, while they receive federal funding. If that was happening, then you'd have a similar situation to what universities are doing.