WASHINGTON, April 8 (Reuters) - U.S. Trade Representative Jamieson Greer told U.S. senators on Tuesday that President Donald Trump's administration will not change tactics on tariffs in the near term and warned that some pain for businesses will be necessary to bring home manufacturing jobs.

During a sometimes tense U.S. Senate Finance Committee hearing, Greer said higher across-the-board tariff rates on 57 trading partners from the European Union to China and Brazil would go into effect at 12:01 a.m. on Wednesday, days after a 10% tariff was imposed on all other countries.

"The president has been clear, again, that he's not doing exemptions or exceptions in the near term," Greer said.

Past tariff carveouts created a "Swiss cheese" approach full of holes that failed to slow the growth of a $1.2 trillion U.S. trade deficit, he said.