By Patricia Zengerle WASHINGTON, Feb 11 (Reuters) - The U.S. House of Representatives on Wednesday narrowly backed a measure disapproving of President Donald Trump's tariffs on Canada, a rare rebuke of the president and leaders of his party in the Republican-majority House.

President Trump's new tariffs could further strain global trade relations, pushing businesses to operate more cautiously and hurting the U.S. economy.

While the vast majority of Canadian exports were exempt from the tariffs now struck down, the ruling does not effect duties harming several key industries.

Ontario Premier Doug Ford says pressure is building on President Donald Trump as courts and Congress push back on his tariff agenda. On Monday, Ford pointed to a U.S.

U.S. allies and partners like the U.K. and the European Union facing higher tariffs but countries like Brazil, China and India get a reprieve.

The anti-tariff House vote will likely prove symbolic, since the measure faces challenging odds in the Senate and a potential veto from Trump, analysts said.

Business chiefs and government leaders are poring over the fallout of a U.S. Supreme Court decision that invalidated some tariffs by President Donald Trump's administration and his response to it.

US automakers now make just a quarter of the cars assembled in Canada. They’re losing influence with Mark Carney’s government, which is looking overseas.