An internal White House economic study found that President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE's tariffs will harm U.S. economic growth, The New York Times reported Thursday.

The analysis, reportedly from the White House Council of Economic Advisers, has not be circulated publicly.

The council's chairman, Kevin Hassett, said Trump was a strong negotiator when asked by the Times if the council had considered the impact of a trade war with China.

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“If you model a future where everybody else reduces their trade barriers to ours, then that’s massively good for the global economy and massively good for the U.S. economy,” Hassett said.

Economists, Democrats and even some Republicans have warned about the harm a trade war could do to U.S. workers.

The Hill has reached out to the White House for comment.

The report comes after the Trump administration last week removed exemptions for tariffs on steel and aluminum imports from the European Union, Canada and Mexico.

Trump has faced substantial international pushback on his trade moves, but he remained combative on the issue Thursday ahead of a G-7 summit in Canada.

Please tell Prime Minister Trudeau and President Macron that they are charging the U.S. massive tariffs and create non-monetary barriers. The EU trade surplus with the U.S. is $151 Billion, and Canada keeps our farmers and others out. Look forward to seeing them tomorrow. — Donald J. Trump (@realDonaldTrump) June 7, 2018

On Wednesday, the World Trade Organization advanced trade complaints against the U.S. from the EU and Canada.

Canada and Mexico have also responded with retaliatory tariffs.

And China announced on Sunday that all trade deals currently being discussed with the U.S. would not go into effect if the administration implemented its proposed tariffs on Chinese goods.