I'm no Trump fan, but from the point of view of America, I have to agree with him:  a deal to take refugees off Australia's hands makes no sense whatsoever.  

What can Obama have been thinking?  There are millions of refugees STILL IN DANGER, not safe under Australian care.  What about them?  

I think this deal was some kind of dirty quid pro quo and Turnbull's nose is out of joint that he can't get his pay-off now that America is governed by someone different.