WASHINGTON — The US Supreme Court on Tuesday upheld Donald Trump’s controversial travel ban targeting Muslim-majority nations, but the president’s "zero tolerance" crackdown on illegal immigration was put on hold for lack of places to detain families arrested at the Mexican border.

The court ruling handed a major victory to Trump in a tortuous legal battle over the Republican leader’s efforts to restrict immigration.

But it follows two embarrassing climbdowns on illegal migration, as Trump and Congress face mounting pressure to legislate a solution to the flashpoint issue.

Conservative jurists prevailed over liberals in Tuesday’s majority opinion from America’s highest court. The 5-4 ruling validated the third and most recent version of the ban, which applies to travelers from five mainly Muslim nations -- Iran, Libya, Somalia, Syria and Yemen -- and from North Korea, about 150 million people in total.

Trump pounced on the decision as an endorsement of his authority to defend national security and "a tremendous success and victory for the American people."

Protesters took to the streets from Washington to Los Angeles and New York to bemoan the decision, and oppose the administration’s hardline approach on the southern border, where 2,000 children remain separated from their migrant parents.

Trump’s executive order "does not exceed any textual limit on the president’s authority," wrote Chief Justice John Roberts in the majority opinion, capping a battle that began just days after Trump took office in January 2017.

"The government has set forth a sufficient national security justification to survive rational basis review. We express no view on the soundness of the policy."

A week into his presidency, Trump fulfilled a campaign promise and announced a 90-day ban on travelers from Iran, Iraq, Libya, Somalia, Sudan, Syria and Yemen.

He repeatedly questioned the loyalty of Muslim immigrants and after a 2015 terror attack in San Bernardino, California, used his campaign to propose a "total and complete shutdown of Muslims entering the United States."

Prepared in secret, the sudden order created chaos as hundreds of travelers were blocked at airports -- with protesters warning that Trump was banning Muslims in violation of the US Constitution’s religious freedom protections.

Courts in several states ruled the measure illegal, and did so again in March 2017 after the administration dropped Iraq from the list.

Trump angrily recast the ban again. Issued in September, the latest version was open-ended, dropped Sudan, and added North Korea and a selection of Venezuelan officials.

Opponents -- and the court’s liberal-leaning justices -- decried what they saw as a measure targeting Muslim countries, and referred back to Trump’s anti-Muslim statements during his election campaign.

The worst attacks in the United States since the Al-Qaeda hijackings on September 11, 2001 have been committed either by Americans or immigrants from countries not affected by the travel ban.

In a scathing dissenting opinion, Justice Sonia Sotomayor wrote: "Based on the evidence in the record, a reasonable observer would conclude that the Proclamation was motivated by anti-Muslim animus." — AFP