Your question was not "Would your opinions be the same if the T-shirts were attacking the Cable News Network by using the phrase 'Clinton News Network' in the same fashion?" Your question was "Would your opinions be the same if the T-Shirts were attacking the Clinton News Network in the same fashion?" Given that half of FR routinely refers to CNN as the "Clinton News Network," nobody is going to blame me for interpreting the question as I did. But if you wish to split hairs, that's fine, I'll answer: Yes, my opinions would be the same. It would still be a derivative, unclever trademark violation, and I wouldn't blame CNN one bit for suing them.
If they wanted to print the t-shirts and give them away for free, now that might be a different ball of wax.