British Prime Minister Theresa May on Friday rebuked President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE's steep tariffs on steel and aluminum imports, calling for the United Kingdom and the European Union to be permanently exempt from the duties.

"I am deeply disappointed at the unjustified decision by the U.S. to apply tariffs to E.U. steel and aluminum imports," May said.

May also rebuffed the Trump administration's claim that such tariffs were necessary to safeguard U.S. national security, noting that steel and aluminum from the U.K. and the EU are used in U.S. defense projects.

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"The U.S., E.U. and U.K. are close allies and have always promoted values of open and fair trade across the world," she said. "Our steel and aluminium industries are hugely important to the U.K., but they also contribute to U.S. industry including in defence projects which bolster U.S. national security.

"The E.U. and U.K. should be permanently exempted from tariffs and we will continue to work together to protect and safeguard our workers and industries."

The statement was May's first direct response to the Trump administration's announcement that it would impose 25 percent tariffs on steel imports and 10 percent tariffs on aluminum imports from the EU, Canada and Mexico.

The move has drawn criticism from some of Washington's most steadfast allies, and has pushed the U.S. to the brink of a trade war with the EU, which has opened up a case against the U.S. at the World Trade Organization.

Officials in Canada, Mexico and the EU have also threatened to impose retaliatory tariffs against U.S. products, ranging from blue jeans to bourbon.

The Trump administration first announced the tariffs in March, but offered temporary exemptions for the EU, Canada and Mexico. Commerce Secretary Wilbur Ross Wilbur Louis RossTrump admin asks Supreme Court to fast-track excluding people in U.S. illegally from census Trump 'very happy' to allow TikTok to operate in US if security concerns resolved TikTok, WeChat to be banned Sunday from US app stores MORE said Thursday, however, that talks with the EU had not progressed enough to warrant another exemption.

The U.S. initially held off on imposing tariffs on Canada and Mexico as it sought to renegotiate the North American Free Trade Agreement. Ross said those talks have taken longer than expected, so the administration decided to levy tariffs on the two countries.

"There is no longer a precise date when they may be concluded, so they were added into list of those who will bear tariffs," he said.