Compare Obama's response to Muslim extremist violence in San Bernardino and Orlando to the reaction to Trump's response to similar attacks.
When Muslim extremists killed people in San Bernardino, California, and Orlando, Florida, I don't ever recall Obama mentioning that the perpetrators were Muslim extremists.  Nor did the mainstream media attack him for hours on end for not saying "Muslim extremist," as it is doing to Trump.  I guess you've conveniently forgotten this, and the hypocrisy which goes along with it.