Opinion | The G.O.P. Bumper Sticker: Trump First. Putin Second. America Third.

Every so often there is a piece of legislation on Capitol Hill that defines America and its values — that shows what kind of country we want to be. I would argue that when it comes to the $118.3 billion bipartisan compromise bill in the Senate to repair our broken immigration system and supply vital aid to Ukraine, Taiwan and Israel, its passage or failure won’t define just America but also the world that we’re going to inhabit.

There are hinges in history, and this is one of them. What Washington does — or does not do — this year to support its allies and secure our border will say so much about our approach to security and stability in this new post-post-Cold War era. Will America carry the red, white and blue flag into the future — or just a white flag? Given the pessimistic talk coming out of the Capitol, it is looking more and more like the white flag — autographed by Donald Trump.

Barring some last-minute surprise that saves the compromise bill, a terrible thing is about to happen — thanks largely to a Republican Party that has lost its way as it falls in lock step behind a man whose philosophy is not “America First” but “Donald Trump First.” “Trump First” means that a bill that would strengthen America and its allies must be set aside so that America can continue to boil in polarization, Vladimir Putin can triumph in Ukraine and our southern border can remain an open sore — until and unless Trump becomes president once more. Our allies be damned. Our enemies be emboldened. Our children’s future security be mortgaged.

Today’s G.O.P. bumper sticker: Trump First. Putin Second. America Third.

“The United States has for some time ceased to be a serious country. Our extreme polarization combined with institutional rules that privilege minorities makes it impossible for us to meet our international obligations,” the political theorist Francis Fukuyama remarked on the American Purpose website. “The Republican Party has grown very adept at hostage holding. … The hard-core MAGA wing represents a minority within a minority, yet our institutional rules permit them to veto decisions clearly favored by a majority of Americans.”

Alas, though, while the current dysfunction of the Republican Party can explain why this particular legislation is likely to fail, how we came to this awful moment is a longer, deeper story.

This emerging post-post-Cold War era is a real throwback to the kind of dangerous, traditional great-power competition prevalent in the Cold War and World War II and most of history before that. Unfortunately, we have arrived at this moment with too many elected officials — especially in the senior ranks of the Republican Party — who never experienced such a world, and with a defense industrial base woefully unprepared for this world. Believe it or not, President Biden’s national security adviser, Jake Sullivan, has had to spend hours of valuable time each month searching the world for 155-milimeter shells for the Ukrainian Army because we don’t have enough.