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Next week, for the third time in eight years, Donald Trump will be nominated as the Republican Party’s candidate for president of the United States. A once great political party now serves the interests of one man, a man as demonstrably unsuited for the office of president as any to run in the long history of the Republic, a man whose values, temperament, ideas and language are directly opposed to so much of what has made this country great.

It is a chilling choice against this national moment. For more than two decades, large majorities of Americans have said they are dissatisfied with the direction of the country, and the post-Covid era of stubborn inflation, high interest rates, social division and political stagnation has left many voters even more frustrated and despondent.

The Republican Party once pursued electoral power in service to solutions for such problems, to building “the shining city on a hill,” as Ronald Reagan liked to say. Its vision of the United States — embodied in principled public servants like George H.W. Bush, John McCain and Mitt Romney — was rooted in the values of freedom, sacrifice, individual responsibility and the common good. The party’s conception of those values was reflected in its longstanding conservative policy agenda, and today many Republicans set aside their concerns about Mr. Trump because of his positions on immigration, trade and taxes. But the stakes of this election are not fundamentally about policy disagreements. The stakes are more foundational: what qualities matter most in America’s president and commander in chief.

Mr. Trump has shown a character unworthy of the responsibilities of the presidency. He has demonstrated an utter lack of respect for the Constitution, the rule of law and the American people. Instead of a cogent vision for the country’s future, Mr. Trump is animated by a thirst for political power: to use the levers of government to advance his interests, satisfy his impulses and exact retribution against those who he thinks have wronged him.

He is, quite simply, unfit to lead.

The Democrats are rightly engaged in their own debate about whether President Biden is the right person to carry the party’s nomination into the election, given widespread concerns among voters about his age-related fitness. This debate is so intense because of legitimate concerns that Mr. Trump may present a danger to the country, its strength, security and national character — and that a compelling Democratic alternative is the only thing that would prevent his return to power. It is a national tragedy that the Republicans have failed to have a similar debate about the manifest moral and temperamental unfitness of their standard-bearer, instead setting aside their longstanding values, closing ranks and choosing to overlook what those who worked most closely with the former president have described as his systematic dishonesty, corruption, cruelty and incompetence.

That task now falls to the American people. We urge voters to see the dangers of a second Trump term clearly and to reject it. The stakes and significance of the presidency demand a person who has essential qualities and values to earn our trust, and on each one, Donald Trump fails.

Presidents are confronted daily with challenges that require not just strength and conviction but also honesty, humility, selflessness, fortitude and the perspective that comes from sound moral judgment.

If Mr. Trump has these qualities, Americans have never seen them in action on behalf of the nation’s interests. His words and actions demonstrate a disregard for basic right and wrong and a clear lack of moral fitness for the responsibilities of the presidency.

He lies blatantly and maliciously, embraces racists, abuses women and has a schoolyard bully’s instinct to target society’s most vulnerable. He has delighted in coarsening and polarizing the town square with ever more divisive and incendiary language. Mr. Trump is a man who craves validation and vindication, so much that he would prefer a hostile leader’s lies to his own intelligence agencies’ truths and would shake down a vulnerable ally for short-term political advantage. His handling of everything from routine affairs to major crises was undermined by his blundering combination of impulsiveness, insecurity and unstudied certainty.

This record shows what can happen to a country led by such a person: America’s image, credibility and cohesion were relentlessly undermined by Mr. Trump during his term.

None of his wrongful actions are so obviously discrediting as his determined and systematic attempts to undermine the integrity of elections — the most basic element of any democracy — an effort that culminated in an insurrection at the Capitol to obstruct the peaceful transfer of power.

On Jan. 6, 2021, Mr. Trump incited a mob to violence with hateful lies, then stood by for hours as hundreds of his supporters took his word and stormed the Capitol with the aim of terrorizing members of Congress into keeping him in office. He praised these insurrectionists and called them patriots; today he gives them a starring role at campaign rallies, playing a rendition of the national anthem sung by inmates involved with Jan. 6., and he has promised to consider pardoning the rioters if re-elected. He continues to wrong the country and its voters by lying about the 2020 election, branding it stolen, despite the courts, the Justice Department and Republican state officials disputing him. No man fit for the presidency would flog such pernicious and destructive lies about democratic norms and values, but the Trumpian hunger for vindication and retribution has no moral center.

To vest such a person with the vast powers of the presidency is to endanger American interests and security at home as well as abroad. The nation’s commander in chief must uphold the oath to “preserve, protect and defend the Constitution.” It is the closest thing that this secular nation has to a sacred trust. The president has several duties and powers that are his alone: He has the sole authority to launch a nuclear weapon. He has the authority to send American troops into harm’s way and to authorize the use of lethal force against individuals and other nations. Americans who serve in the military also take an oath to defend the Constitution, and they rely on their commander in chief to take that........

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