He has endorsed and encouraged cyberespionage against the U.S. government by a foreign government: (http://www.usnews.com/opinion/articles/2016-07-27/trump-encourages-russi...)
He has endorsed the committal of war crimes as a plan of action in dealing with enemies of the United States: (http://www.huffingtonpost.com/entry/donald-trump-terrorists_us_56e0d7cde...)
He has repeatedly taken a stance of racism and prejudice which is in direct conflict with the U.S. Constitution, specifically in his comments on Mexicans and Muslims. He does not embrace or embody the essence of equality and liberty that our country was founded on. (http://abcnews.go.com/Politics/donald-trump-calls-total-complete-shutdow...)