A group supported by conservative mega-donors Charles and David Koch slammed 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 on Tuesday over his announced steel and aluminum tariffs on the European Union, Canada and Mexico.

"The tax cuts and reduction in regulatory barriers enacted by the Trump administration has helped economic growth and job creation. Wages have increased and unemployment rates are the lowest in decades," Freedom Partners spokesman James Davis said in a statement.

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“All this success will be greatly undermined by the imposition of new taxes on working Americans. Trade barriers make Americans as a whole poorer and they especially harm those already disadvantaged. Trade wars hurt everyone. They trigger retaliatory tariffs from our trade partners. That raises prices on American families who need affordable access to household goods. We urge the Trump administration to abandon these tariffs," he continued.

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 announced earlier Thursday that the administration had decided to end the temporary exemptions for the three key trading allies despite their two months of lobbying to avoid the tariffs.

“We look forward to continued negotiations with Canada and Mexico on one hand and with the European Commission on the other hand as there are other issues we need to get resolved,” Ross said.

The Kochs have spoken out against tariff measures from the administration in the past.

Charles Koch ripped Trump's announced tariffs on steel and aluminum and encouraged corporate leaders to reject the plan earlier this year.

"One might assume that, as the head of Koch Industries — a large company involved in many industries, including steel — I would applaud such import tariffs because they would be to our immediate and financial benefit. But corporate leaders must reject this type of short-term thinking, and we have," Koch said.