That opening part of the article is simply a lie. I've listened to Trump's McCain comment a number of times, and that's not even close to what was said.
See this article from Wisconsin: Donald Trump attacks Scott Walker after 'DumbDumb' insult
In the past week Walker has thoroughly denounced Trump, has had his top aide call Trump a 'dumbdumb', and had George Will continue his onslaught, Will's wife being a major operative for the Walker Campaign.
What does that sound like to you?
Had forgotten the Wills connection. Thanks for reminding me. Will send Fox a note of displeasure next time he is on.