President Donald Trump crashed the U.N. General Assembly on Tuesday like a bull in a china shop, warning rogue regimes from North Korea to Iran with decidedly undiplomatic language unfamiliar in the halls of the international body.

Trump named names — including nicknames — in his call for the world to isolate North Korea. He called that country’s dictator, Kim Jong-Un, “Rocket Man,” a moniker he first unveiled on Twitter, to complaints from his critics in the United States. He said America has shown great patience with the regime’s provocative language and continued nuclear and long-range ballistic missile tests.

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“But if it is forced to defend itself or its allies, we will have no choice but to totally destroy North Korea,” he said, with the North Korean delegation seated in the front row. “Rocket Man is on a suicide mission for himself and for his regime. The United States is ready, willing and able — but hopefully, this will not be necessary.”

Trump demanded not just a halt to North Korea’s intercontinental ballistic missile testing but full denuclearization — something the regime is unlikely ever to accept.

“It is an outrage that some nations would not only trade with such a regime but would arm, supply, and financially support a country that imperils the world with nuclear conflict.”

The president said no country has shown more contempt for other nations or its own people. He reminded the world of Otto Warmbier, an American who was imprisoned and returned to the United States earlier this year in a vegetative state, days before he died. And Trump called on the rest of the world to shut off trade and relations with North Korea.

“It is an outrage that some nations would not only trade with such a regime but would arm, supply and financially support a country that imperils the world with nuclear conflict,” he said.

It was an indisputably “America First” speech by the “America First” president, evidenced by the fact that the diplomats who watched it mostly sat stone-faced, with only a smattering of applause during the 41-minute address.

Trump said the United States would continue to pursue “principled realism” on the international stage. He said his country always would be a great friend to the world.

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“But we can no longer be taken advantage of, or enter into a one-sided deal where the United States gets nothing in return,” he said. “As long as I hold this office, I will defend America’s interests above all else.”

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Trump turned his attention to another rogue state — Iran — and hinted that he might withdraw from the nuclear agreement that former President Barack Obama negotiated.

“We cannot abide by an agreement if it provides cover for the eventual construction of a nuclear program,” he said. “The Iran deal was one of the worst and most one-sided transactions the United States has ever entered into. Frankly, that deal is an embarrassment to the United States, and I don’t think you’ve heard the last of it. Believe me.”

Trump said his country stands ready to ratchet up pressure on the socialist regime in Venezuela and said he expected concrete actions from Cuba before improving relations. He defended his decision to launch an airstrike on Syria over its use of chemical weapons.

The president said he recognizes that different countries have different values and different systems of government. But he added that every nation must respect the sovereignty and right to peace of other nations.

Trump said the United Nations holds great potential but must reform itself.

“To put it simply, we meet at a time of both immense promise and great peril. It is entirely up to us whether we lift the world to new heights or let it fall into a valley of disrepair,” he said. “We have it in our power, should we so choose, to lift millions from poverty, to help our citizens realize their dreams and to ensure that new generations of children are raised free from violence, hatred and fear.”

Trump said it is an “embarrassment” to the United Nations that countries with abysmal human-rights records sit on the U.N. Human Rights Council. He also said the United States — one of 193 countries in the organization — pays 22 percent of the budget.

“In fact, we pay far more than anyone realizes,” he said.

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Trump offered a forceful defense of his views on trade and migrations. Mass immigration hurts sending countries by reducing pressure on their governments to reform and robbing them of the talent and energy of people need to carry out those reforms, he said. And it destabilizes the countries that receive the migrants.

On trade, Trump said he would not accept one-sided deals that hollow out America’s industrial base. Globalists, he added, gave many assurances that those deals would benefit all sides.

“But as those promises flowed, millions of jobs vanished and thousands of factories disappeared,” he said. “Others gamed the system and broke the rules, and our great middle class — once the bedrock of American prosperity — was forgotten and left behind. But they are forgotten no more. And they will never be forgotten again.”