Actually, that would be you. Or, more accurately, it would be the ignorance, stupidity, and hatred you so completely embody. No one politician, even the president, has sufficient power to completely compromise the future of the country. What does, however, is the lack of critical thinking skills, a willingness to accept propaganda at face value and unthinkingly regurgitate it, placing wishful thinking and dogma ahead of education and science, the promotion of greed at the expense of charity, the promotion of apathy at the plight of countrymen over action, place bigotry over acceptance. I've seen you posting for a while now, and frankly, you are the concentrated essence of everything wrong with America. It's like God was running out of places to put the worst aspects of humanity and so just stuffed it all in you to get it over with so he could move on to other things.
What is a threat to America in the long term isn't the bumbling of a president of questionable competence; it is a culture that exalts the greedy, the exploitative, the malicious, the ignorant, and the dogmatic at the expense of the destitute, the industrious, the caring, the learned, and the free thinking. The only person here who so completely and utterly channels the worst qualities of the world as we know it as yourself is Incorruptible and he is a parody poster.