He decided to do its first campaign on paper imports, he said, because the tariffs — which were approved in October — could raise textbook prices.
He risks alienating steel producers and unions in those states before next year's presidential elections if he stops the tariffs, which were imposed in March.
Looking at the tariffs, which covered pages, it is easy to see why getting accurate computerised billing was one of BT's biggest headaches in the 1980s.
More than half the European steel exports to the United States originally covered by the tariffs, which will last three years and range from 8percentto30percentcent, have now been exempted, the commission said.
The tariffs, which Mr. Isabelle described as "a little bit of gravy," have had the effect of choking off low-priced foreign supplies, making it easier for domestic producers to raise prices.
The president views the tariffs — which would be particularly harmful for German automakers — as his key to unlocking what he wants from Europe, namely more access for American beef, chicken, dairy and wine.
Yet the United States does not control the global economy, and the tariffs, which Mr. Trump is expected to sign next week, could incite other countries to challenge it at the World Trade Organization.
Trump met his top trade advisers on Thursday to decide when to activate the tariffs, which come as relations with other major trading partners, Canada, the EU and Mexico, have worsened following a fractious meeting of the G7 leaders.
The Chinese Ministry of Commerce indicated that the tariffs, which it first publicly suggested almost two weeks ago, were intended to pressure the Trump administration to back down from a simmering trade war.
Lighthizer told the Senate Finance Committee that the European Union, Argentina, Australia, Brazil and South Korea will not be hit by the tariffs, which take effect at 12 01 a.m.
Opponents of the tariffs, which include solar developers and installers who have benefited from the abundance of cheap panels, have argued that the tariffs will actually harm the domestic industry, making it more difficult for American companies to do business abroad.
