Should have done this already, it’s almost October.
For all we know, he has. We don't know what sort of pressure he has applied out of the public eye. His remarks this morning were in response to a question.
And even if he hasn't, the dishonorable candidates have free will, and there is plenty of value in letting them show their asses. Trump's success doesn;t depend on them, thank goodness, and the party does need a good, thorough house cleaning.