(& Why should he?) TRUMP WON'T DEFEND OBAMA:"Trump breaks silence on no response to Obama Muslim comments, says not 'morally obligated' "| Fox News

"...
His next tweet was: "If someone made a nasty or
controversial statement about me to the president,
do you really think he would come to my rescue? No
chance!"..."

http://www.foxnews.com/politics/2015/09/19/trump-break-silence-on-no-response-to-obama-muslim-comments-says-not-morally/