“Actually, someone else said he could shoot someone in the street and his supporters would still like him and when he heard about it, he laughed and repeated what someone else said.”
That’s how I remembered it as well, but the last time that I tried to find the originator of the quote I couldn’t find it.
I think it came from some “Tweet” or something, originally.
There was a huge thread on it, here and somebody found the origin of it.