See this thought-provoking response to Krugman's Op Ed:
americanmanifesto.news
The response gives a deeper looking angle on Krugman's excellent comment! And the reference to the US Army's 1945 analysis of the roots of authoritarian tyrannies (primarily nationalistic fascism, but similar to how tyranny of the left evolves, too) should be widely published and part of every world history course.
Still, while this article focuses on the evolution of our democracy into proto-kleptofascism, America's immediate threat is the lunacy of America's Executive Branch leadership, first, and the complicity of the Legislative and Judicial branches, second.
One reason America's government is quickly marching toward kleptofascism is because of billions of dollars in quasi-legal contributions from elite oligarchs for "Inaugural Balls", pre-inaugural IPO's of silly "meme-coins", or for exclusive "gala dinners" with Trump (and hundreds of others seeking influence-for-money), and the exploitation by foreign influence seekers of Trump's weakness for adulation and expensive gifts or investments in his, his family's or close friends' business ideas (no matter how ill-advised they might be). For Trump, extravagance buys influence.
Make no mistake, Trump's unprecedented boldness and lunacy is running point for right-wing extremists who love that Trump is taking the flack for them as he lays waste to centuries of American pluralism and its protective legal infrastructure.
If the USA can elect a hostile, kleptocratic, authoritarian boor like DJT and a pro-fascist Congress that abdicates its responsibility to uphold its US Constitutional duty to check the actions of a rogue executive branch, then Americans should not expect much deference or love from other law abiding democracies.