Downing Street said no reciprocal action is "off the table" if the US fails to honour its tariff deal with the UK.

It added that "no one wants a trade war."

• Donald Trump announced a 15% tariff on all countries starting Tuesday.

• The UK prime minister’s official spokesman said:

  • The "majority" of the UK-US deal (including tariffs on cars, steel, and pharmaceuticals) is not expected to change.

  • The situation is "evolving."

  • Discussions between the UK and US are ongoing.

• The European Union put its US tariff deal on hold following the 15% announcement.

• Trump warned countries that "play games" would face even higher tariffs.

• The US Supreme Court ruled that most global tariffs announced last year were unlawful.

  • The court said Trump had overstepped his powers.

  • The ruling affected tariffs introduced under the International Emergency Economic Powers Act (IEEPA), including those from "Liberation Day."

• Trump replaced the struck-down tariffs with:

  • A new 10% global tariff.

  • A revised 15% global tariff announced Saturday.

• The 15% tariff will be temporarily introduced under Section 122 of the 1974 Trade Act.

• Some products will be exempt, including:

  • Critical minerals

  • Metals

  • Pharmaceuticals

• Analysis from Global Trade Alert (GTA) found:

  • The UK would be among the worst hit if the 15% tariff proceeds.

  • This is because the UK had negotiated a lower 10% tariff deal.

  • Countries like China and Brazil, which already face higher tariffs, would be better off.

• The 15% global tariff does not affect existing UK-US sector agreements covering:

  • Steel

  • Aluminium

  • Pharmaceuticals

  • Automobiles

  • Aerospace

• These sectors represent most of the UK's trade with the US.

• Only sectors without separate agreements would face the 15% rate.

• This is because Section 122 differs from the mechanism used to impose sector-specific tariffs.

• British Chambers of Commerce President Andy Haldane said:

  • The UK would sit "towards the bottom of the league table" of trade partners under the 15% tariff.

  • Allies that secured good deals have been most disadvantaged.

• US Trade Representative Jamieson Greer told CBS:

  • He spoke with the EU and other countries over the weekend.

  • The deals were not dependent on the emergency tariff litigation outcome.

  • The US expects to stand by its deals and for partners to do the same.

• Despite this, the European Parliament said it would put its US deal "on hold until further notice."

• Bernd Lange, chair of the Parliament’s international trade committee, said:

  • The situation is "more uncertain than ever."

  • Clarity and legal certainty are needed before further steps.

• Trump posted on Truth Social:

  • Countries that "play games" over the Supreme Court decision would face much higher tariffs.

• The UK prime minister’s spokesman said:

  • The UK’s approach to the US has been pragmatic.

  • Productive conversations are ongoing at all levels.

  • Nothing is off the table.

  • The focus is on avoiding escalation and retaining the UK’s competitive advantage.

• Make UK director of international business Richard Rumbelow said:

  • UK exporters are concerned about further trade disruption.

  • Urgent clarity is needed on how UK exports will be treated upon entry into the US.