It doesn’t seem to have hurt Trump one bit.
You’re right, it’s not going to hurt Trump at all. Bwah hah hah hah!!! This will enrage McCain even more, maybe he’ll have a rage seizure that leaves him paralyzed and unable to speak.
The cowardly (and delusional) McCain thinks he can say whatever nasty thing he wants because he’s dying. Plus he thinks he’s an untouchable “war hero.” BARF