With this latest incredibly ignorant position, it's becoming more and more obvious that even The Donald is not this blindingly stupid.
He knows what he's doing, and IMO the strategy is now clear.
Trump and other Republicans know that he doesn't have a snowball's chance in hell to get the nomination. Sure, he could still contribute money, lot's of money. But is there something else that he can contribute?
He's got the bully pulpit of his TV shows, his guest appearances, daily coverage in much of the print media; he's the political version of Charlie Sheen: an irrational, embarrassing attention-seeker who's getting all the attention he wants.
Since he doesn't have to preserve any real credibility, since he doesn't have to worry about building future alliances and consensus, since he's free to burn every bridge in sight, why not do exactly that? Why not wildly throw his arms around and do as much damage as he can while he has the spotlight? Why not fling as much unsubtantiated shit as his handlers can supply?
Some of it's going to stick.
And the Republican Party, including the genuine candidates—one of whom will eventually emerge—are quietly allowing, and behind the scenes, encouraging him to continue his filthy act.