In a series of tweets, Trump says he has no obligation to defend President Obama:
Am I morally obligated to defend the president every time somebody says something bad or controversial about him? I don’t think so!…If I would have challenged the man, the media would have accused me of interfering with that man’s right of free speech. A no win situation!…This is the first time in my life that I have caused controversy by NOT saying something…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!