US President Donald Trump has said he will impose a 10% global tariff for 150 days to replace some of his emergency duties that were struck down by the US Supreme Court.
Mr Trump said that his order would be made under Section 122 of the Trade Act of 1974 and the duties would be over and above tariffs that are currently in place.
The statute allows the president to impose duties of up to 15% for up to 150 days on any and all countries related to "large and serious" balance of payments issues. It does not require investigations or impose other procedural limits.
The US Supreme Court ruled that Mr Trump exceeded his authority in imposing a swathe of tariffs that upended global trade, blocking a key tool the president has wielded to impose his economic agenda.
He described the decision declaring his sweeping global tariffs illegal as "deeply disappointing".
Mr Trump also told reporters he was "absolutely ashamed" of "certain members" of the conservative-dominated court who ruled against him.
He launched a strident attack on the six justices who issued the majority ruling, particularly the three conservative judges in the 6-3 majority.
Calling them "fools" and "lapdogs of Rinos" (Republicans in name only), he said they were "very unpatriotic and disloyal to our constitution".
He accused the court of being influenced by foreign powers, and political groups in Washington DC. He also lashed out at the plaintiffs in the case, calling them "sleaze-bags".
He said that there were even stronger methods on trade tariffs available to him, and announced a 10% global tariff to be imposed on top of other tariffs.
"The Supreme Court's decision today made a president's ability to both regulate trade and impose tariffs more powerful and more crystal clear, rather than less," he said.
"We have alternatives, great alternatives," Mr Trump said. "Could be more money. We'll take in more money and we'll be a lot stronger for it," Mr Trump said of the alternative tools.
Mr Trump said his administration also was initiating several Section 301 unfair trade practices investigations "to protect our country from unfair trading practices of other countries and companies".
The conservative-majority high court ruled six-three in the judgment, saying the International Emergency Economic Powers Act (IEEPA) "does not authorise the president to impose tariffs".
The ruling does not impact sector-specific duties that Mr Trump has separately imposed on imports of steel, aluminum and various other goods.
On 2 April last year, on a date Mr Trump labelled "Liberation Day," the president announced what he called "reciprocal" tariffs on goods imported from most US trading partners, invoking IEEPA to address what he called a national emergency related to US trade deficits, though the US already had run trade deficits for decades.
Tánaiste and Minister for Finance Simon Harris said the Government is "monitoring the situation closely" following the US Supreme Court ruling on tariffs.
Minister for Foreign Affairs and Trade Helen McEntee said she noted the ruling and described it as a "significant development".
The European Union said it is carefully analysing the court's decision and will continue to advocate for low tariffs.
While Mr Trump has long used tariffs as a lever for pressure and negotiations, he made unprecedented use of emergency economic powers upon returning to the presidency last year to slap new duties on virtually all US trading partners.
These included so-called "reciprocal" tariffs over trade practices that the White House deemed unfair, alongside separate sets of duties targeting major partners Mexico, Canada and China over illicit drug flows and immigration.
Now, thousands of businesses will decide whether to pursue refunds, as it means more than $175 billion (€148bn) in US tariffs collected could be refunded, Penn-Wharton Budget Model economists said.
The court noted that "had Congress intended to convey the distinct and extraordinary power to impose tariffs" with IEEPA, "it would have done so expressly, as it consistently has in other tariff statutes".
Read more: What happens next after US tariff ruling?
Formal probes which could ultimately lead to more such sectoral tariffs remain in the works.
The US Supreme Court's decision affirms earlier findings by lower courts that tariffs Mr Trump imposed under IEEPA were illegal.
A lower trade court had ruled in May that Mr Trump overstepped his authority with across-the-board levies and blocked most of them from taking effect, but that outcome had been put on hold as the US government sought an appeal.
An EU spokesperson said the bloc remained in close contact with the US administration and was seeking clarity on what steps it would take.
"We take note of the ruling by the US Supreme Court and are analysing it carefully. We remain in close contact with the US administration as we seek clarity on the steps they intend to take in response to this ruling," said the spokesperson.
"Businesses on both sides of the Atlantic depend on stability and predictability in the trading relationship. We therefore continue to advocate for low tariffs and to work towards reducing them," added the spokesperson.
The UK government said it expected its "privileged" trading position with the US to continue after the ruling.
"The UK enjoys the lowest reciprocal tariffs globally, and under any scenario we expect our privileged trading position with the US to continue", a British government spokesperson said in a statement.
"We will work with the (US) administration to understand how the ruling will affect tariffs for the UK and the rest of the world," they added.
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Additional reporting Sean Whelan
