WATCH: Trump Blasts Global Leaders in UN Speech

Here’s what he said: "If you don’t stop people that you’ve never seen before, that you have nothing in common with, your country is going to fail. I’m the president of the United States, but I worry about Europe. I love Europe, I love the people of Europe. And I hate to see it being devastated by energy and immigration, that double-tailed monster that destroys everything in its wake."

Then he directly addressed European leaders: "You’re doing it because you want to be nice. You want to be politically correct, and you’re destroying your heritage."

Nonetheless, Trump insisted it was "the greatest con job ever perpetrated on the world in my opinion."

He said "all of these predictions were wrong" and "made by stupid people," adding, "If you don’t get away from this green scam, your country is going to fail."

"Let’s put it this way: People don’t like to take big loads of drugs in boats anymore," he said, promising more attacks if he deems it necessary.

"Please be warned that we will blow you out of existence," he said after the two attacks that U.S. officials said killed 14 people.

Many Democrats and some Republicans have questioned Trump’s policy as a potential overreach of executive authority in part because the military was used for law enforcement purposes.

"Once we started detaining and deporting everyone who crossed the border — and removing illegal aliens from the United States — they simply stopped coming," he said.

The president called his efforts a "humanitarian act," arguing that it saved people who might have otherwise died trying to cross the U.S. border illegally.

He claimed that would "stop the bloodshed .. very quickly" but also suggested fighting will not end as long as China and European nations continue buying Russian energy.

"They’re funding the war against themselves. Who the hell ever heard of that one?" Trump said.

Speaking to world leaders at the U.N. General Assembly, Trump also criticized several European nations, including U.S. allies, for recognizing a Palestinian state, which he called a reward to Hamas for its Oct. 7, 2023, attacks in Israel that sparked the current conflict.

"As if to encourage continued conflict, some in this body seek to unilaterally recognize a Palestinian state," Trump said. "This would be a reward for these horrible atrocities, including October 7th. But instead of giving in to Hamas as ransom demands, those who want peace should be united with one message: release the hostages now."

"Just release the hostages now."

"I’ve always said the U.N. has such tremendous, tremendous potential. But it’s not even coming close to living up to that potential," Trump said. "For the most part, at least for now, all they seem to do is write a really strongly worded letter and then never follow that letter. It’s empty words and empty words don’t solve war."

U.N. chief warns world leaders

With global peace and progress under siege, the United Nations chief challenged world leaders Tuesday to choose a future where the rule of law triumphs over raw power and where nations come together rather than scramble for self-interests.

Secretary-General Antonio Guterres said the U.N.’s founders faced the same questions 80 years ago, but he told today’s world leaders at the opening of their annual gathering at the General Assembly that the choice of peace or war, law or lawlessness, cooperation or conflict, is "more urgent, more intertwined, more unforgiving."

"We have entered in an age of reckless disruption and relentless human suffering," he said in his annual "state of the World" speech. "The pillars of peace and progress are buckling under the weight of impunity, inequality and indifference."

But despite all the internal and external challenges facing the U.N., he and General Assembly President Annalena Baerbock pleaded with its members not to give up. "If we stop doing the right things, evil will prevail," Baerbock said in her opening remarks.

Guterres said the leaders’ first obligation is to choose peace, and without naming any countries, he urged all parties -- including those in the Assembly chamber – to stop supporting Sudan’s warring parties.