
The order raises import taxes for US-based firms buying the metals from other countries from Wednesday - but the levy remains at 25% for the UK.
However, the UK could end up facing the higher rate if its deal signed with the Trump administration last month, which would see steel and aluminium tariffs axed, does not come into force.
Imports of UK steel into America are currently subject to tariffs, but the UK government said it wanted to implement the agreement to remove them "as soon as possible".
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