National Security Head General McMaster and Trump Chief Economic Council Gary Cohen wrote an editorial for the Wall Street Journal a few days ago. It is behind a paywall, but the important pieces are in this Defense One post.
The singular most critical passage - and one of the most critical changes to American Policy since 1941 - is this:
That is, to be honest, an abrogation of everything America has fought for, both figuratively and literally, since the end of World War II.
America has predicated its very being as a member of the "global community". Ronald Reagan referred to the United States as the "Shimmering City on the Hill" as a democratic ideal for the world. We fight against terrorism world wide as a global community. We worked to define an economic system that benefits us, of course, but also is designed to raise billions out of poverty.
Sure, we aren't always following our own guidelines, but to repudiate our history and collective will as a people because of one election is frightening.
That paragraph spells out in black and white that we are a bully and don't care about the world or the people in it, past what we can get out of them.