He's addressed it since then, even "today" (taped interview, I think).
Just saying that the observation and consideration of opposing Kasich and Cruz in the future has more basis than only the remarks that Trump made to the Ohio volunteers the day after the convention.
I have no idea what Trump has said since. However, it is ludicrous on the face of it. Kasich is term limited. He will not be running for reelection. This is really a non-story stemming from a joke that was blown way out of proportion. The same thing as the "plagiarism" of two paragraphs by Melania. Typical Dem tactics aided by their MSM allies.