That the man in question should be Donald Trump, with all his personal flaws, challenges the United States and the world as never before in human history.

[Donald Trump] said that he would encourage Japan and South Korea to develop their own nuclear arsenals to lower U.S. costs, and then has denied that he would encourage nuclear proliferation to allies (although he did say so).

The most positive policy proposal [Donald] Trump will bring to the table as president is his desire to improve and strengthen relations between the U.S. and Russia, which have deteriorated badly in recent years.

[Donald] Trump has said that he would do away with the Iran Deal negotiated by the U.S. and five of its allies with Iran, and yet he recently backed away from vowing to scrap the Iran Deal for now.

Even though [Donald] Trump is reported to not read very much and to have a limited range of experience, he is often certain that he is right and boldly asserts the correctness of his positions.

[Donald] Trump's behavior during the presidential campaign was often erratic, seemingly based on discernable personality traits, including narcissism, arrogance, impulsiveness, and a lack of predictability.

[Donald] Trump's narcissism seems to be reflected in his need to be liked and treated positively.