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The United States will delay its deal to remove tariffs on U.K. steel and aluminum because of concerns about post-Brexit trade rules affecting Northern Ireland, the Financial Times reported on Wednesday.

The administration of former U.S. President Donald Trump imposed 25 per cent and 10 per cent tariffs on steel and aluminum imports on the European Union in 2018. The tariffs were withdrawn in October of this year, but they remain in place for Britain due to its exit from the EU.

In a communication seen by the newspaper, a U.S. Commerce Department official was quoted as saying that talks with the U.K. on easing metals tariffs could not move ahead.

The official cited U.S. concerns about British threats to trigger emergency clause Article 16, the report said, especially from the U.S. Congress.

Article 16 is an emergency brake that allows the U.K. or EU to seek to suspend parts of the Brexit agreement that introduced some checks on the movement of goods to Northern Ireland from mainland Britain if they lead to persistent difficulties.

The FT said that the United States had informed the U.K. about the reason for the delay.

The U.K. department of trade said: “We do not see any connection with this particular issue and the Northern Ireland Protocol and it will in no way affect the UK’s approach. That is because significant changes are needed to the Protocol in order to protect the Belfast (Good Friday) Agreement and Northern Ireland’s place in the U.K. internal market.”

A spokesman for Prime Minister Boris Johnson said: “I think it’s important not to conflate those two issues.”

“On steel tariffs, we are working closely with the Biden administration. It’s encouraging they are taking steps to de-escalate the issue and we are very focused on agreeing a resolution that removes damaging tariffs,” he told reporters.

The United States has expressed grave concerns that disagreement between London and Brussels over the implementation of the 2020 Brexit treaty could undermine the Good Friday accord, which effectively ended three decades of violence in Northern Ireland.

In September, U.S. House of Representatives Speaker Nancy Pelosi cautioned that there could be no post-Brexit trade deal with Washington if the Northern Ireland peace agreement was destroyed.

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