As U.S. and Israeli forces pounded Iran, and Tehran and its affiliates retaliated by firing missiles at targets across the Mideast on Monday, the international legal order was caught in the crossfire.

At the heart of the post-World War II global order — United Nations headquarters in New York — Secretary-General António Guterres told the Security Council on Saturday that U.S. and Israeli airstrikes violated international law, including the U.N. Charter. He also condemned Iran's retaliatory attacks for violating the sovereignty and territorial integrity of nations in the Mideast.

Officials in the Trump administration insist that the military campaign is a lawful measure to ensure Tehran does not build nuclear weapons. "It's a matter of global security. And to that end, the United States is taking lawful actions," Trump's U.N. ambassador, Mike Waltz, said.

Iranian Foreign Minister Abbas Araghchi wrote in a letter to the U.N. on Sunday that the killing of Supreme Leader Ayatollah Ali Khamenei "constitutes a grave and unprecedented breach of the most fundamental norms governing relations among States."

On Monday, Defense Secretary Pete Hegseth bullishly defended the U.S. military campaign. "No stupid rules of engagement, no nation building quagmire, no democracy building exercise, no politically correct wars. We fight to win and we don't waste time or lives," he said at the Pentagon.

The war with Iran comes less than two months after U.S. forces swooped into Caracas to capture former Venezuelan President Nicolás Maduro and fly him to New York to face justice.

David Crane, an American expert on international law and founding prosecutor of a United Nations court that prosecuted crimes in Sierra Leone, wrote in an analysis that U.S. attacks in Iran and Venezuela "highlight a dangerous trend: the normalization of unilateral force as a tool of foreign policy. Even when the outcome is positive, the violation of international law and constitutional limits sets a precedent that threatens global stability and undermines America's own legal foundations."

In Washington, many Democrats have called the strikes illegal. They argue that under the Constitution, only Congress has the power to declare war. They say the Trump administration failed to lay out its rationale or plan for the military strikes, and the aftermath.

Congress hurriedly scheduled a war powers debate for Monday over Trump's authority to bomb Iran.

The Trump administration's latest policy of deporting immigrants to "third countries" to which they have no ties is unlawful and must be set aside, a federal judge ruled Wednesday in a case that already reached the nation's highest court.

U.S. District Judge Brian E. Murphy in Massachusetts agreed to suspend his decision for 15 days, giving the government time to appeal his latest ruling in the case. Murphy noted that the U.S. Supreme Court ruled in the administration's favor last year, pausing Murphy's previous decision and clearing the way for a flight carrying several migrants to complete its trip to war-torn South Sudan, where they had no ties.

Murphy said migrants challenging the Department of Homeland Security's policy have the right to "meaningful notice" and an opportunity to object before they are removed to a third country. The policy "extinguishes valid challenges to third-country removal by effecting removal before those challenges can be raised," the judge concluded.

"These are our laws, and it is with profound gratitude for the unbelievable luck of being born in the United States of America that this Court affirms these and our nation's bedrock principle: that no 'person' in this country may be 'deprived of life, liberty, or property, without due process of law,'" Murphy wrote.

In June, the Supreme Court's conservative majority found that immigration officials can quickly deport people to third countries. Liberal justices Sonia Sotomayor and Ketanji Brown Jackson dissented, saying the ruling gives the government special treatment.

Murphy said President Donald Trump's administration has repeatedly violated — or tried to violate — his orders. Last March, he noted, the Defense Department deported at least six class members to El Salvador and Mexico without providing the process required under a temporary restraining order that Murphy issued. DHS issued its new policy guidance for third-country removals on March 30, two days after Murphy's order.

"The simple reality is that nobody knows the merits of any individual class member's claim because (administration officials) are withholding the predicate fact: the country of removal," wrote Murphy, who was nominated to the bench by Democratic President Joe Biden.

Murphy said the DHS third-country removal policy has targeted immigrants who were granted protection from being sent back to their home countries, where they feared being tortured or persecuted in other ways.

Eight men who were sent to South Sudan in May had been convicted of crimes in the U.S. and had final orders of removal, Immigration and Customs Enforcement officials have said.

President Donald Trump on Monday threatened to block the opening of a new Canadian-built bridge across the Detroit River, demanding that Canada turn over at least half of the ownership of the bridge and agree to other unspecified demands in his latest salvo over cross-border trade issues.

“We will start negotiations, IMMEDIATELY. With all that we have given them, we should own, perhaps, at least one half of this asset,” Trump said in a lengthy social media post, complaining that the United States would get nothing from the bridge and that Canada did not use U.S. steel to built it.

The Gordie Howe International Bridge, named after a Canadian hockey star who played for the Detroit Red Wings for 25 seasons, had been expected to open in early 2026, according to information on the project’s website. The project was negotiated by former Michigan Gov. Rick Snyder — a Republican — and paid for by the Canadian government to help ease congestion over the existing Ambassador Bridge and Detroit-Windsor tunnel. Work has been underway since 2018.

It’s unclear how Trump would seek to block the bridge from being opened, and the White House did not immediately return a request for comment on more details. The Canadian Embassy in Washington also did not immediately return a request for comment.

Trump’s threat comes as the relationship between the U.S. and Canada increasingly sours during the U.S. president’s second term. The United States-Mexico-Canada trade agreement is up for review this year, and Trump has been taking a hard-line position ahead of those talks, including by issuing new tariff threats.

Canadian Prime Minister Mark Carney, meanwhile, has spoken out on the world stage against economic coercion by the United States.

“So to shoot yourself in the foot and threaten the Gordie Howe Bridge means that this guy has completely lost the plot on what’s good for us versus just what’s spite against the Canadians,” Slotkin said.

Michigan, a swing state that Trump carried in both 2016 and 2024, has so far largely avoided the brunt of his second-term crackdown, which has targeted blue states with aggressive immigration raids and cuts to federal funding for major infrastructure projects.

Trump and Democratic Gov. Gretchen Whitmer have also maintained an unusually cordial relationship, with the president publicly praising her during an Oval Office appearance last April. The two also shared a hug last year ahead of Trump’s announcement of a new fighter jet mission for an Air National Guard base in Michigan.

While Canada paid for the project, the bridge will be operated under a joint ownership agreement between Michigan and Canada, said Stacey LaRouche, press secretary to Whitmer.

Rep. Shri Thanedar, the Democratic House representative of Detroit, said blocking the bridge would be “crazy” and said Trump’s attacks on Canada weren’t good for business or jobs. “The bridge is going to help Michigan’s economy. There’s so much commerce between Michigan and Canada. They’re one of our biggest partners,” Thanedar said.

Democratic Rep. Debbie Dingell of Ann Arbor brushed aside the president’s threat, saying she’s looking forward to the bridge’s opening later in the spring. “And I’ll be there,” Dingell said.